diff --git a/chapter1/01_swift.html b/chapter1/01_swift.html
index 18a7e16e..9f0a665c 100644
--- a/chapter1/01_swift.html
+++ b/chapter1/01_swift.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1.1" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="1.1" data-basepath=".." data-revision="1402677669306">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_4">
+                    <section class="normal" id="section-gitbook_83">
                     
                         <blockquote>
 <p>翻译：numbbbbb</p>
diff --git a/chapter1/02_a_swift_tour.html b/chapter1/02_a_swift_tour.html
index 12c5b84b..c74d4e29 100644
--- a/chapter1/02_a_swift_tour.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1.2" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="1.2" data-basepath=".." data-revision="1402677669306">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_6">
+                    <section class="normal" id="section-gitbook_85">
                     
                         <blockquote>
 <p>翻译：numbbbbb
diff --git a/chapter1/chapter1.html b/chapter1/chapter1.html
index a6b4fdf7..a6d9a7da 100644
--- a/chapter1/chapter1.html
+++ b/chapter1/chapter1.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_8">
+                    <section class="normal" id="section-gitbook_87">
                     
                         <h1 id="-swift">欢迎使用 Swift</h1>
 <p>在本章中您将了解 Swift 的特性和开发历史，并对 Swift 有一个初步的了解。</p>
diff --git a/chapter2/01_The_Basics.html b/chapter2/01_The_Basics.html
index 8810740c..59fb5eac 100644
--- a/chapter2/01_The_Basics.html
+++ b/chapter2/01_The_Basics.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.1" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.1" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_15">
+                    <section class="normal" id="section-gitbook_90">
                     
                         <blockquote>
 <p>翻译：numbbbbb, lyuka, JaySurplus</p>
diff --git a/chapter2/02_Basic_Operators.html b/chapter2/02_Basic_Operators.html
index e3485168..79128345 100644
--- a/chapter2/02_Basic_Operators.html
+++ b/chapter2/02_Basic_Operators.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.2" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.2" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_32">
+                    <section class="normal" id="section-gitbook_111">
                     
                         <blockquote>
 <p>翻译：xielingwang</p>
diff --git a/chapter2/03_Strings_and_Characters.html b/chapter2/03_Strings_and_Characters.html
index ea9177b1..d91e5d39 100644
--- a/chapter2/03_Strings_and_Characters.html
+++ b/chapter2/03_Strings_and_Characters.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.3" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.3" data-basepath=".." data-revision="1402677669306">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_11">
+                    <section class="normal" id="section-gitbook_92">
                     
                         <blockquote>
 <p>翻译：wh1100717</p>
diff --git a/chapter2/04_Collection_Types.html b/chapter2/04_Collection_Types.html
index 7b64f33b..8e099792 100644
--- a/chapter2/04_Collection_Types.html
+++ b/chapter2/04_Collection_Types.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.4" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.4" data-basepath=".." data-revision="1402677669306">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_13">
+                    <section class="normal" id="section-gitbook_94">
                     
                         <blockquote>
 <p>翻译：zqp</p>
diff --git a/chapter2/05_Control_Flow.html b/chapter2/05_Control_Flow.html
index 780640e6..99dac727 100644
--- a/chapter2/05_Control_Flow.html
+++ b/chapter2/05_Control_Flow.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.5" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.5" data-basepath=".." data-revision="1402677669306">
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     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_17">
+                    <section class="normal" id="section-gitbook_96">
                     
                         <blockquote>
 <p>翻译：vclwei, coverxit, NicePiao</p>
@@ -643,7 +643,7 @@ for _ in 1...power {
 println(&quot;\(base) to the power of \(power) is \(answer)&quot;)
 // 输出 &quot;3 to the power of 10 is 59049&quot;
 </code></pre>
-<p>这个例子计算 base 这个数的 power 次幂（本例中，是<code>3</code>的<code>10</code>次幂），从<code>1</code>（<code>3</code>的<code>0</code>次幂）开始做<code>3</code>的乘法， 进行<code>10</code>次，使用<code>1</code>到<code>10</code>的半闭区间循环。这个计算并不需要知道每一次循环中计数器具体的值，只需要执行了正确的循环次数即可。下划线符号<code>_</code>（替代循环中的变量）能够忽略具体的值，并且不提供循环遍历时对值的访问。</p>
+<p>这个例子计算 base 这个数的 power 次幂（本例中，是<code>3</code>的<code>10</code>次幂），从<code>1</code>（<code>3</code>的<code>0</code>次幂）开始做<code>3</code>的乘法， 进行<code>10</code>次，使用<code>1</code>到<code>10</code>的闭区间循环。这个计算并不需要知道每一次循环中计数器具体的值，只需要执行了正确的循环次数即可。下划线符号<code>_</code>（替代循环中的变量）能够忽略具体的值，并且不提供循环遍历时对值的访问。</p>
 <p>使用<code>for-in</code>遍历一个数组所有元素：</p>
 <pre><code class="lang-swift">let names = [&quot;Anna&quot;, &quot;Alex&quot;, &quot;Brian&quot;, &quot;Jack&quot;]
 for name in names {
diff --git a/chapter2/06_Functions.html b/chapter2/06_Functions.html
index 818a9724..2d990ba9 100644
--- a/chapter2/06_Functions.html
+++ b/chapter2/06_Functions.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.6" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.6" data-basepath=".." data-revision="1402677669306">
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     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_19">
+                    <section class="normal" id="section-gitbook_98">
                     
                         <blockquote>
 <p>翻译：honghaoz</p>
diff --git a/chapter2/07_Closures.html b/chapter2/07_Closures.html
index 17373511..709901e9 100644
--- a/chapter2/07_Closures.html
+++ b/chapter2/07_Closures.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.7" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.7" data-basepath=".." data-revision="1402677669306">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_21">
+                    <section class="normal" id="section-gitbook_100">
                     
                         <blockquote>
 <p>翻译：wh1100717</p>
diff --git a/chapter2/08_Enumerations.html b/chapter2/08_Enumerations.html
index b443497e..2da2075f 100644
--- a/chapter2/08_Enumerations.html
+++ b/chapter2/08_Enumerations.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.8" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.8" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_23">
+                    <section class="normal" id="section-gitbook_102">
                     
                         <blockquote>
 <p>翻译：yankuangshi</p>
diff --git a/chapter2/09_Classes_and_Structures.html b/chapter2/09_Classes_and_Structures.html
index 5aa6625f..97ca093f 100644
--- a/chapter2/09_Classes_and_Structures.html
+++ b/chapter2/09_Classes_and_Structures.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.9" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.9" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_25">
+                    <section class="normal" id="section-gitbook_104">
                     
                         <blockquote>
 <p>翻译：JaySurplus</p>
diff --git a/chapter2/10_Properties.html b/chapter2/10_Properties.html
index 36d45ff0..d02aabda 100644
--- a/chapter2/10_Properties.html
+++ b/chapter2/10_Properties.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.10" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.10" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_26">
+                    <section class="normal" id="section-gitbook_105">
                     
                         <blockquote>
 <p>翻译：shinyzhu</p>
diff --git a/chapter2/11_Methods.html b/chapter2/11_Methods.html
index 416d08bf..0e514a1a 100644
--- a/chapter2/11_Methods.html
+++ b/chapter2/11_Methods.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.11" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.11" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_28">
+                    <section class="normal" id="section-gitbook_107">
                     
                         <blockquote>
 <p>翻译：pp-prog</p>
diff --git a/chapter2/12_Subscripts.html b/chapter2/12_Subscripts.html
index b6d4af4e..12dfce3f 100644
--- a/chapter2/12_Subscripts.html
+++ b/chapter2/12_Subscripts.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.12" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.12" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_30">
+                    <section class="normal" id="section-gitbook_109">
                     
                         <blockquote>
 <p>翻译：siemenliu</p>
diff --git a/chapter2/13_Inheritance.html b/chapter2/13_Inheritance.html
index b913c241..825a2c5d 100644
--- a/chapter2/13_Inheritance.html
+++ b/chapter2/13_Inheritance.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.13" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.13" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_9">
+                    <section class="normal" id="section-gitbook_88">
                     
                         <blockquote>
 <p>翻译：Hawstein</p>
diff --git a/chapter2/14_Initialization.html b/chapter2/14_Initialization.html
index ac040dc2..b718c296 100644
--- a/chapter2/14_Initialization.html
+++ b/chapter2/14_Initialization.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.14" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.14" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_34">
+                    <section class="normal" id="section-gitbook_113">
                     
                         <blockquote>
 <p>翻译：lifedim</p>
diff --git a/chapter2/15_Deinitialization.html b/chapter2/15_Deinitialization.html
index 79d2778e..70a0339d 100644
--- a/chapter2/15_Deinitialization.html
+++ b/chapter2/15_Deinitialization.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.15" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.15" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_36">
+                    <section class="normal" id="section-gitbook_115">
                     
                         <blockquote>
 <p>翻译：bruce0505</p>
diff --git a/chapter2/16_Automatic_Reference_Counting.html b/chapter2/16_Automatic_Reference_Counting.html
index 0d7571f8..be4f7fa0 100644
--- a/chapter2/16_Automatic_Reference_Counting.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.16" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.16" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_38">
+                    <section class="normal" id="section-gitbook_117">
                     
                         <blockquote>
 <p>翻译：TimothyYe</p>
diff --git a/chapter2/17_Optional_Chaining.html b/chapter2/17_Optional_Chaining.html
index bd33cd6f..984f2103 100644
--- a/chapter2/17_Optional_Chaining.html
+++ b/chapter2/17_Optional_Chaining.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.17" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.17" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_40">
+                    <section class="normal" id="section-gitbook_119">
                     
                         <blockquote>
 <p>翻译：Jasonbroker</p>
diff --git a/chapter2/18_Type_Casting.html b/chapter2/18_Type_Casting.html
index 5f5b52a5..a1c451d6 100644
--- a/chapter2/18_Type_Casting.html
+++ b/chapter2/18_Type_Casting.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.18" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.18" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_42">
+                    <section class="normal" id="section-gitbook_121">
                     
                         <blockquote>
 <p>翻译：xiehurricane</p>
diff --git a/chapter2/19_Nested_Types.html b/chapter2/19_Nested_Types.html
index 5f1fd0e9..b37366bd 100644
--- a/chapter2/19_Nested_Types.html
+++ b/chapter2/19_Nested_Types.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.19" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.19" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_44">
+                    <section class="normal" id="section-gitbook_123">
                     
                         <blockquote>
 <p>翻译：Lin-H</p>
diff --git a/chapter2/20_Extensions.html b/chapter2/20_Extensions.html
index 7d1c4ed1..e3d0fda9 100644
--- a/chapter2/20_Extensions.html
+++ b/chapter2/20_Extensions.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.20" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.20" data-basepath=".." data-revision="1402677669306">
     <div class="book-header">
     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_46">
+                    <section class="normal" id="section-gitbook_125">
                     
                         <blockquote>
 <p>翻译：lyuka</p>
diff --git a/chapter2/21_Protocols.html b/chapter2/21_Protocols.html
index a25334a3..cba371d6 100644
--- a/chapter2/21_Protocols.html
+++ b/chapter2/21_Protocols.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2.21" data-basepath=".." data-revision="1402676386943">
+    <div class="book"  data-level="2.21" data-basepath=".." data-revision="1402677669306">
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     <!-- Actions Left -->
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_48">
+                    <section class="normal" id="section-gitbook_127">
                     
                         <blockquote>
 <p>翻译：geek5nan</p>
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index 32677308..2fb4590d 100644
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_50">
+                    <section class="normal" id="section-gitbook_129">
                     
                         <blockquote>
 <p>翻译：takalard</p>
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-    <div class="book"  data-level="2.23" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_52">
+                    <section class="normal" id="section-gitbook_131">
                     
                         <blockquote>
 <p>翻译：xielingwang</p>
diff --git a/chapter2/chapter2.html b/chapter2/chapter2.html
index af9c990c..4dc01039 100644
--- a/chapter2/chapter2.html
+++ b/chapter2/chapter2.html
@@ -46,7 +46,7 @@
 
 
         
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_54">
+                    <section class="normal" id="section-gitbook_133">
                     
                         <h1 id="swift-">Swift 教程</h1>
 <p>本章介绍了 Swift 的各种特性及其使用方法，是全书的核心部分。</p>
diff --git a/chapter3/01_About_the_Language_Reference.html b/chapter3/01_About_the_Language_Reference.html
index 6fb4ab69..30e4b2fb 100644
--- a/chapter3/01_About_the_Language_Reference.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.1" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_57">
+                    <section class="normal" id="section-gitbook_136">
                     
                         <blockquote>
 <p>翻译：ChildhoodAndy</p>
diff --git a/chapter3/02_Lexical_Structure.html b/chapter3/02_Lexical_Structure.html
index b77d67c8..cb25c822 100644
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.2" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_65">
+                    <section class="normal" id="section-gitbook_144">
                     
                         <blockquote>
 <p>翻译：superkam</p>
diff --git a/chapter3/03_Types.html b/chapter3/03_Types.html
index d94d3252..b0814ab4 100644
--- a/chapter3/03_Types.html
+++ b/chapter3/03_Types.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.3" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_59">
+                    <section class="normal" id="section-gitbook_138">
                     
                         <blockquote>
 <p>翻译：lyuka</p>
diff --git a/chapter3/04_Expressions.html b/chapter3/04_Expressions.html
index 55b3b9b2..3a89a79c 100644
--- a/chapter3/04_Expressions.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.4" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_61">
+                    <section class="normal" id="section-gitbook_140">
                     
                         <blockquote>
 <p>翻译：sg552</p>
diff --git a/chapter3/05_Declarations.html b/chapter3/05_Declarations.html
index a2b48e48..6839b203 100644
--- a/chapter3/05_Declarations.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.6" data-basepath=".." data-revision="1402676386943">
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     <!-- Actions Left -->
     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_63">
+                    <section class="normal" id="section-gitbook_142">
                     
                         <blockquote>
 <p>翻译：marsprince</p>
diff --git a/chapter3/06_Attributes.html b/chapter3/06_Attributes.html
index 7cfe8bee..ddf1cd09 100644
--- a/chapter3/06_Attributes.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.7" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_55">
+                    <section class="normal" id="section-gitbook_134">
                     
                         <blockquote>
 <p>翻译：Hawstein</p>
diff --git a/chapter3/07_Patterns.html b/chapter3/07_Patterns.html
index 88b141c0..ac7586e9 100644
--- a/chapter3/07_Patterns.html
+++ b/chapter3/07_Patterns.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.8" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_67">
+                    <section class="normal" id="section-gitbook_146">
                     
                         <blockquote>
 <p>翻译：honghaoz</p>
diff --git a/chapter3/08_Generic_Parameters_and_Arguments.html b/chapter3/08_Generic_Parameters_and_Arguments.html
index 71e167b8..7e428359 100644
--- a/chapter3/08_Generic_Parameters_and_Arguments.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="3.9" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_69">
+                    <section class="normal" id="section-gitbook_148">
                     
                         <blockquote>
 <p>翻译：fd5788</p>
diff --git a/chapter3/09_Summary_of_the_Grammar.html b/chapter3/09_Summary_of_the_Grammar.html
index a5ef480b..75e3e868 100644
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@@ -44,7 +44,7 @@
 
 
         
-    <div class="book"  data-level="3.10" data-basepath=".." data-revision="1402676386943">
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@@ -585,7 +585,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_71">
+                    <section class="normal" id="section-gitbook_150">
                     
                         <blockquote>
 <p>翻译：StanZhai</p>
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index 8466cfc5..6c2d52f1 100644
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-    <div class="book"  data-level="3.5" data-basepath=".." data-revision="1402676386943">
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@@ -587,7 +587,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_73">
+                    <section class="normal" id="section-gitbook_152">
                     
                         <blockquote>
 <p>翻译：coverxit</p>
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index 88f31b62..14641bb5 100644
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                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_3">
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                         <blockquote>
 <p>Swift 中文翻译组：364279588（要求对翻译感兴趣）</p>
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index f83440ff..ba4600f7 100644
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index 69363180..638d83b2 100644
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ile和do-whil","if或els","if语句中条件的值的类型必须遵循logicvalu","if语句中，条件必须是一个布尔表达式——这意味着像if","if语句允许二选一，也就是当条件为fals","if语句和switch","if语句和switch语句。通常，当条件较为简单且可能的情况很少时，使用if语句。而switch语句更适用于条件较复杂、可能情况较多且需要用到模式匹配（pattern-match","if语句最简单的形式就是只包含一个条件，当且仅当该条件为tru","if语句来判断一个可选是否包含值。如果可选有值，结果是true；如果没有值，结果是fals","if语句用于判断是不是特别热。而最后的els","if语句的第一个分支中操作actualnumber的值，你可以改成if","if语句类似。与之不同的是，switch","ignor","imag","img","implement","implicit","implicit-member-express","implicit-parameter-nam","implicitdoubl","implicitinteg","implicitli","implicitly-unwrapped-optional-typ","implicitlyunwrappedoptional<str","implicitlyunwrappedstr","import","import-declar","import-kind","import-path","import-path-identifi","import-path-identifier­.­import-path","in-out","in-out-express","in-out参数的讨论，参见in-out参数(in-out","in-out参数，可以在参数类型前加inout前缀。但是你不可以对可变长参数或返回值类型使用inout。关于in-out参数的讨论见章节in-out","in-out）参数来交换a和b的值，请参考[写入读出参数][1","inch","increment","increment(7","incrementbi","incrementby(amount","incrementbyseven","incrementbyseven和incrementbyten","incrementbysevne捕获了一个新的runningtotal变量，该变量和incrementbyten","incrementbyten","incrementbyten的常量，该常量指向一个每次调用会加10的incrementor","incrementforcount(count","incrementforcount不能被调用时，尝试使用可选属性``fixedincr","incrementforcount方法后，int型可选值通过可选绑定(opt","incrementor","incrementor从上下文中捕获了两个值，runningtotal和amount","incrementor函数并没有获取任何参数，但是在函数体内访问了runningtotal和amount变量。这是因为其通过捕获在包含它的函数体内已经存在的runningtotal和amount","incrementor时，其会以amount作为增量增加runningtot","incrementor，其会有一个属于自己的独立的runningtot","increment方法通过可选链，尝试从两种可选成员中获取count","independ","index","indexisvalidforrow(row","index在循环结束后最终的值是3而不是2。最后一次调用递增表达式++index会将index设置为3，从而导致index","index常量只存在于循环的生命周期里。如果你想在循环完成后访问index的值，又或者想让index","index是一个每次循环遍历开始时被自动赋值的常量。这种情况下，index在使用前不需要声明，只需要将它包含在循环的声明中，就可以对其进行隐式声明，而无需使用let","index的值被更新为闭区间中的第二个数字（2），之后println","individualscor","infer","infix","infix-operator-attribut","infix-operator-declar","inform","inherit","inheritance）定义一个基类（bas","inheritingprotocol","inherit）另一个类的方法（methods），属性（property）和其它特性。当一个类继承其它类时，继承类叫子类（subclass），被继承类叫超类（或父类，superclass","init","init()。这个init()构造器为新食物提供了一个默认的占位名字，通过代理调用同一类中定义的指定构造器init(nam","init()和init(origin:s","init(area","init(cent","init(center:size:)可以自己将origin和size的新值赋值到对应的属性中。然而尽量利用现有的构造器和它所提供的功能来实现init(center:s","init(coin","init(fromfahrenheit","init(fromkelvin","init(leg","init(nam","init(numb","init(origin","init(paramet","init(r","init(radiu","init(row","init(s","init(sid","init(sidelength","init(text","init(width:height","init)来代替之前版本中的setup操作。构造器中含有一个名为generator，类型为randomnumbergenerator的形参，使得它可以接收任意遵循randomnumbergener","init/subscript","initi","initia","initialbit","initialbits操作，然后赋值给invertedbits这个新常量。这个新常量的值等于所有位都取反的initialbits，即1变成0，0变成1，变成了11110000，十进制值为240","initializer-bodi","initializer-declar","initializer-express","initializer-head","initializer-head­generic-parameter-clause­opt­parameter-claus","initializer-head­generic-parameter-clause­opt­parameter-clause­initializer-bodi","initializers)和成员级构造器(memberwis","initializers），那么对于来自你的扩展构造器中的值类型，你可以调用默认构造器(default","initializer表达式用来给某个typ","initialsquarecent","initialz","initialzation、condit","init关键字之前放置conveni","init（greet","init，并在里面将存储型属性temperature的值初始化为32.0","inout","inout­opt­var­#­opt­parameter-name­local-parameter-nam","inout。如何使用assign","input","insert(atindex","insert函数调用把值为&quot;mapl","insid","instanc","instruct","int","int&gt","int&gt;。字典实例创建完成之后通过附属脚本的方式将整型值2赋值到字典实例的索引为bird","int&gt;就是用具体的string和int类型替代泛型类型keytyp","int&gt;引用命名型类型dictionary&lt;str","int(generator.random","int(pi","int(spe","int)(b","int))包含两个元素：第一个是命名型类型int，第二个是另一个复合型类型(int","int)——也就是说，一个函数传入一个int然后输出作为另一个函数的输入，然后又返回一个int。例如，你可以使用如下嵌套函数来重写柯里化函数addtwonumb","int)或者(str","int)类型的元组中使用值绑定来分类下图中的点(x","int)类型的元组来分类下图中的点(x","int)，只匹配两个元素都是int这种类型的元组。如果仅需要限制一个元组模式中的某几个元素，只需要直接对这几个元素提供类型注释即可。例如，在let","int)，它可以用来产生新recipeingredient实例的所有属性值。这个构造器一开始先将传入的quantity参数赋值给quantity属性，这个属性也是唯一在recipeingredient中新引入的属性。随后，构造器将任务向上代理给父类food的init(nam","int...。可变长参数被认为是一个包含了基础类型元素的数组。即int...就是int","int...被看做是int","int16","int16.max","int16整型能承载的整数范围是-32768到32767","int8","int8.max","int8.min","int8类型的常量或者变量可以存储的数字范围是-128~127，而uint8类型的常量或者变量能存储的数字范围是0~255","int?值，不论使用了多少层链接返回的总是int","int[](count","integ","integer-liter","integerpi","integertodescrib","integertodescribe的值不属于列表中的任何质数，那么它不会匹配到第一个switch分支。而这里没有其他特别的分支情况，所以integertodescribe匹配到包含所有的default","integervalu","integer）、浮点数（floating-point）、布尔值（booleans）、字符串（string)、数组（array）和字典（dictionari","interestingnumb","interfac","interlac","intern","interpol","interpolation）的方式把常量名或者变量名当做占位符加入到长字符串中，swift","intstack","intstack指定了container的实现，适用的itemtype被用作int类型。对于这个contain","intstack类型只能用于int值，不过，其对于定义一个泛型stack","intstack类型实现了container协议的所有三个要求，在intstack","intstack类型的非泛型版本，适用于遵循contain","intuint浮点数类型安全和类型推测数值型字面量数值型类型转换整数转换整数和浮点数转换类型别名布尔值元组可选if","int。swift","int值没有足够的位数，即下标越界，那么上述实现的下标会返回0，因为它会在数字左边自动补0","int值类型的数组，我们不能往其中插入任何不是int","int值都可以找到一个匹配的行星。正因为如此，fromraw方法可以返回一个可选的枚举成员。在上面的例子中，possibleplanet是planet?类型，或“可选的planet","int值，不论使用了多少层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on实例建立多个引用。由于这些变量是被定义为可选类型（person?，而不是person），它们的值会被自动初始化为nil，目前还不会引用到person","personnam","person和apart","person和apartment实例并将类实例赋值给john和number73","person和apartment的例子一致，但是有一个重要的区别。这一次，apartment的ten","person和apartment的例子展示了两个属性的值都允许为nil","person和resid","person和residence模型通过添加一个room和一个address","person实例依然保持对apartment实例的强引用，但是apartment实例只是对person实例的弱引用。这意味着当你断开john变量所保持的强引用时，再也没有指向person","person实例有一个类型为string，名字为name的属性，并有一个可选的初始化为nil的apartment属性。apart","person实例现在有了一个指向apartment实例的强引用，而apartment实例也有了一个指向person实例的强引用。因此，当你断开john和number73","person实例的引用数量，并且会在person","person实例，它的resid","person实例，这也意味着你不再使用这个person","person类开始，并定义了一个叫nam","person类有一个构造函数，此构造函数为实例的name属性赋值并打印出信息，以表明初始化过程生效。person","person类的新实例被赋值给了reference1变量，所以reference1到person类的新实例之间建立了一个强引用。正是因为这个强引用，arc","person类的构造函数的时候，&quot;john","person结构体含有一个名为fullnam","peter","pi","piec","pink","pixel","place","plai","plane","planet","planet.earth","planet.earth.toraw","planet.fromraw(7","planet.fromraw(9)语句获得一个可选planet，如果可选planet可以被获得，把someplanet设置成该可选planet的内容。在这个范例中，无法检索到位置为9的行星，所以els","planet.fromraw(positiontofind","planet.uranu","planet.venus的原始值是2","player","player(coin","player(nam","player.completedlevel(1","player.tracker.advancetolevel(6","playernam","playeron","playerone!.coinsinpurs","playerone!.wincoins(2_000","playerone变量设置为nil，意思是“没有player实例”。当这种情况发生的时候，playerone变量对player实例的引用被破坏了。没有其它属性或者变量引用play","playerone是可选的，所以由一个感叹号（!）来修饰，每当其wincoins方法被调用时，coinsinpurs","player实例存储在一个名为playerone的可选play","player类使用leveltrack","player类创建一个新的leveltracker实例来监测这个用户的发展进度。他提供了completedlevel方法：一旦玩家完成某个指定等级就调用它。这个方法为所有玩家解锁下一等级，并且将当前玩家的进度更新为下一等级。（我们忽略了advancetolevel返回的布尔值，因为之前调用leveltracker.unlocklevel","player类定义了一个wincoins方法，该方法从银行获取一定数量的硬币，并把它们添加到玩家的钱包。player类还实现了一个析构函数，这个析构函数在play","pleas","plu","plusminusvector","plusthre","pm","point","point(x","point.0","point.1","pointonefouronefivenin","point封装了一个(x","point来引用元组(int","point来表示square的中心点。如代码所示，它正确返回了中心点(5","point结构体定义了一个变异方法（mut","point（x","pop","pop并移除值&quot;cuatro&quot","pop方法的返回值，该返回值将是一个t","posit","positiontofind","possibl","possibleinteg","possibleintegervalu","possiblenumb","possiblenumber.toint","possiblenumber.toint返回的可选int包含一个值，创建一个叫做actualnumb","possibleplanet","possiblestr","postfix","postfix-express","postfix-expression­.­decimal-digit","postfix-expression­.­dynamictyp","postfix-expression­.­identifier­generic-argument-clause(opt","postfix-expression­.­init","postfix-expression­.­self","postfix-expression­[­expression-list","postfix-expression­parenthesized-express","postfix-expression­parenthesized-expression­(opt)­trailing-closur","postfix-expression­postfix-oper","postfix-oper","postfix-operator-declar","postfix-self-express","potentialoverflow","powder","power","pp-prog","pp-prog告诉我，这几天太累了，校对到一半睡着了，醒来又继续做。2点17","preced","precedence-claus","precedence-clause­opt­associativity-clause­opt","precedence-level","precedence­precedence-level","precedence并优先级(preced","prefix","prefix-express","prefix-expression­binary-expressions(opt","prefix-oper","prefix-operator-declar","prefix存在时，将prefix插入到name之前来为starship构建fullnam","prefix）表达式，二元（binary）表达式，主要（primary）表达式和后缀（postfix）表达式。表达式可以返回一个值，以及运行某些逻辑（caus","preslei","prettytextrepresent","prettytextrepresentable协议的同时，也需要遵循textrepresent","prettytextrepresentable协议继承了textrepresent","primari","primary-express","prime","print","print(\"\\(codeunit","print(\"\\(scalar.valu","print(\"\\n","print(\"conson","print(\"oth","print(\"vowel","printandcount","printandcount(\"hello","printandcount(stringtoprint","printclassnam","printhelloworld","printletterkinds(\"hello","printletterkinds(word","printletterkinds的输入是一个string值并对其字符进行迭代。在每次迭代过程中，考虑当前字符的kind计算属性，并打印出合适的类别描述。所以printletterkinds就可以用来打印一个完整单词中所有字母的类型，正如上述单词&quot;hello&quot","println","println(\"'\\\\(word","println(\"(0","println(\"(\\(point.0","println(\"(\\(somepoint.0","println(\"(\\(x","println(\"3的6倍是\\(threetimestable[6","println(\"\\(airportcod","println(\"\\(animalname)","println(\"\\(bas","println(\"\\(country.name)'","println(\"\\(currentvalu","println(\"\\(index","println(\"\\(mansioncount","println(\"\\(nam","println(\"\\(possiblenumb","println(\"\\(scalar","println(\"\\(somecharact","println(\"\\(total.vowel","println(\"a","println(\"about","println(\"access","println(\"ad","println(\"airport","println(\"al","println(\"an","println(\"and","println(\"apart","println(\"area","println(\"automaticcar","println(\"b","println(\"bicycl","println(\"car","println(\"card","println(\"cinema","println(\"count","println(\"eww","println(\"gam","println(\"goodby","println(\"happi","println(\"hd","println(\"hello","println(\"here'","println(\"highest","println(\"i'm","println(\"index","println(\"it","println(\"it'","println(\"item","println(\"john'","println(\"level","println(\"lot","println(\"media","println(\"mmm","println(\"mostli","println(\"movi","println(\"not","println(\"on","println(\"play","println(\"playeron","println(\"qr","println(\"random","println(\"result","println(\"rol","println(\"som","pr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保证支持等式操作。为了说明这个事实，当你定义一个函数时，你可以写一个equat","equatable，也就意味着“任何t类型都遵循equat","equilater","equilateraltriangl","equilateraltriangle(sidelength","equival","ericzyh","error","error(error","error(str","escaped-charact","evaluation）&quot","even","everyth","evilcom","ewa","eww","exampleclass","exampleenum","exampleenum.a的值是0，exampleenum.b的值是。因为exampleenum.c的值被显式的设定为5","exampleenum.d的值会自动增长为6","examplemodule.mytyp","exampleprotocol","execut","exist","explicit","explicit-member-express","explicitdoubl","exponentdoubl","export","express","expression)。起保护作用的表达式是这样构成的：关键字where后面跟着一个作为额外测试条件的表达式。因此，当且仅当控制表达式匹配一个cas","expression-el","expression-element-list","expression-element­,­expression-element-list","expression-list","expression-pattern","expression.dynamictyp","expression.init（initi","expression.memb","expression.self","expression[index","expressions）sort","expressions）二元表达式（binari","expressions）函数调用表达式（funct","expressions）前缀表达式（prefix","expressions）字符型表达式（liter","expressions）赋值表达式（assign","expression­,­expression-list","expression­:­express","expression）dynamic表达式（dynam","expression）self表达式（self","expression）。通常会增加或减少计数器的值，或者根据语句（stat","expression）初始化函数表达式（initi","expression）可选链表达式（optional-chain","expression）后缀self表达式（postfix","expression）后缀表达式（postfix","expression）圆括号表达式（parenthes","expression）强制取值表达式（forced-valu","expression）显式成员表达式（explicit","expression）被调用，如果表达式调用结果为false，循环结束，继续执行for","expression）超类表达式（superclass","expression）通配符表达式（wildcard","expression）闭包表达式（closur","expression）附属脚本表达式（subscript","expression）隐式成员表达式（implicit","expression），switch","exp，那这个数相当于基数和10^exp","exp，那这个数相当于基数和2^exp","extens","extension-bodi","extension-declar","extensions）扩展语法（extens","extension­type-identifier­type-inheritance-clause­opt­extension-bodi","extern","f","f()和f(x:7)都是只有一个变量x的函数的有效调用，但是f(7","f(7","f(x","f.temperatur","face字符的utf-16","face的4","face的unicod","face，unicod","fahrenheit","fahrenheit时为属性temperatur","fahrenheit，它拥有一个double类型的存储型属性temperatur","fail","failur","fall","fallthrough","fallthrough-stat","fallthrough关键字。下面的例子使用fallthrough","fallthrough语句。关于fallthrough","fallthrough语句可出现在switch","fallthrough语句用于在switch语句中传递控制权。fallthrough语句会把控制权从switch","fallthrough语句，详情请参考贯穿（fallthrough","fallthrough）区间匹配（rang","fals","false。同样的，item","false，但是我们是知道紧急情况下重置的密码的，所以整个复杂表达式的值还是tru","false，整个表达式的值就为false。事实上，如果第一个值为fals","fd5788","feed","feed）\\n","feed）（u+000a）、回车符（carriag","feed）（u+000c）以及空（null）（u+0000","feet","few","fibonacci","filenam","file），它返回的是当前modul","final","finalsquar","finalsquare、board、square和dicerol","finalsquare）和while方式相同，但是只会在循环结束后进行计算。在这个游戏中，do-while表现得比while循环更好。do-while方式会在条件判断square没有超出后直接运行squar","finalsquare，这表明你必须刚好落在方格25","final来防止它们被重写，只需要在声明关键字前加上@final特性即可。（例如：@fin","findindex([\"mik","findindex([3.14159","findindex<t","findindex<t>(arrai","findindex中这个单个类型参数写做：t","findindex函数现在则可以成功的编译过，并且作用于任何遵循equatable的类型，如double或str","findindex，用某个类型t","findstringindex","findstringindex(arrai","findstringindex(str","findstringindex的泛型版本findindex。请注意这个函数仍然返回int","findstringindex的非泛型函数，该函数功能是去查找包含一给定string值的数组。若查找到匹配的字符串，findstringindex函数返回该字符串在数组中的索引值（int），反之则返回nil","first","first-class）类型。它们采用了很多传统上只被类（class)所支持的特征，例如计算型属性（comput","firstbit","firstbits和otherbits都有一个1跟另一个数不同的。所以按位异或的结果是把它这些位置为1，其他都置为0","firstforloop","firstitem","firstnumb","firstnumber是一个值为10的常量，secnodename是一个值为42","firstprotocol","firstroomnam","firstsixbit","firstsixbits和lastsixbits中间4个位都为1。对它俩进行按位与运算后，就得到了00111100，即十进制的60","firstvalu","firstvector","five","fiveeight","fiveonezero","fixedincr","fixedlengthrang","fixedlengthrange(firstvalu","fixedlengthrange的实例包含一个名为firstvalue的变量存储属性和一个名为length的常量存储属性。在上面的例子中，length","fixedpoint","fixedpoint.movebyx(2.0","flat","float","floating-point","floating-point-","floating-point-liter","floating-point-p","float并指定初始值为4","float表示32","flour","flow","flow）中介绍，当考虑一个枚举的成员们时，一个switch语句必须全面。如果忽略了.west这种情况，上面那段代码将无法通过编译，因为它没有考虑到compasspoint","follow","food","food(nam","food、recipeingredient以及shoppinglistitem","food的子类recipeingredient。recipeingredient类构建了食谱中的一味调味剂。它引入了int类型的数量属性quantity（以及从food继承过来的name属性），并且定义了两个构造器来创建recipeingredi","food类中的构造器init(nam","food类提供了一个接受单一参数name的指定构造器。这个构造器可以使用一个特定的名字来创建新的food","food，它是一个简单的用来封装食物名字的类。food类引入了一个叫做name的string类型属性，并且提供了两个构造器来创建food","for-in","for-in-stat","for-infor条件递增（for-condition-increment）whil","for-init","for-in循环和半闭区间操作（..）来迭代somecontainer中的所有元素。对于每个元素，函数检查是否somecontainer中的元素不等于对应的anothercontainer中的元素，如果这两个元素不等，则这两个容器不匹配，返回fals","for-in循环来遍历字符串中的字符（charact","for-in循环来遍历某个字典中的键值对。每一个字典中的数据项都由(kei","for-in循环的介绍请参见for","for-in循环请参见for","for-in循环，swift","for-in循环，用来更简单地遍历数组（array），字典（dictionary），区间（range），字符串（str","for-in用来遍历一个区间（range），序列（sequence），集合（collection），系列（progress","for-in语句允许在重复执行代码块的同时，迭代集合（或遵循sequ","for-in语句或者变量或常量申明时，它可以包含通配符模式，标识符模式或者其他包含这两种模式的模式。例如，下面这段代码是不正确的，因为(x","for-stat","forc","force-unwrap","forced-valu","forced-value-express","forget","forkei","fork，超过30人参与翻译和校对工作，项目最高排名github总榜第4","form","for—that","for和while循环，基于特定条件选择执行不同代码分支的if和swi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量参数和变量参数（const","parameters）无参函数（funct","parameters）无返回值函数（funct","parameters）输入输出参数（in-out","parameter­,­parameter-list","parent","parenthes","parenthesized-express","passedretinascan","passeng","pattern","pattern-initi","pattern-initializer-list","pattern-matched)的，和其相反的是switch语句case块中枚举事件匹配，在枚举事件类型(enumer","patternastyp","patterns）表达式模式（express","patterns）通配符模式（wildcard","pattern）代表了单个值或者复合值的结构。例如，元组(1","pattern）值绑定模式（value-bind","pattern）元组模式（tupl","pattern）和元组模式（tupl","pattern）枚举案例模式（enumer","pattern）标识符模式（identifi","pattern）类型转换模式（type-cast","pattern），标识符模式（identifi","penguin","pepper","performact","perimet","person","person'","person(fullnam","person(nam","person?的变量，用来按照代码片段中的顺序，为新的person实例建立多个引用。由于这些变量是被定义为可选类型（person?，而不是person），它们的值会被自动初始化为nil，目前还不会引用到person","personnam","person和apart","person和apartment实例并将类实例赋值给john和number73","person和apartment的例子一致，但是有一个重要的区别。这一次，apartment的ten","person和apartment的例子展示了两个属性的值都允许为nil","person和resid","person和residence模型通过添加一个room和一个address","person实例依然保持对apartment实例的强引用，但是apartment实例只是对person实例的弱引用。这意味着当你断开john变量所保持的强引用时，再也没有指向person","person实例有一个类型为string，名字为name的属性，并有一个可选的初始化为nil的apartment属性。apart","person实例现在有了一个指向apartment实例的强引用，而apartment实例也有了一个指向person实例的强引用。因此，当你断开john和number73","person实例的引用数量，并且会在person","person实例，它的resid","person实例，这也意味着你不再使用这个person","person类开始，并定义了一个叫nam","person类有一个构造函数，此构造函数为实例的name属性赋值并打印出信息，以表明初始化过程生效。person","person类的新实例被赋值给了reference1变量，所以reference1到person类的新实例之间建立了一个强引用。正是因为这个强引用，arc","person类的构造函数的时候，&quot;john","person结构体含有一个名为fullnam","peter","pi","piec","pink","pixel","place","plai","plane","planet","planet.earth","planet.earth.toraw","planet.fromraw(7","planet.fromraw(9)语句获得一个可选planet，如果可选planet可以被获得，把someplanet设置成该可选planet的内容。在这个范例中，无法检索到位置为9的行星，所以els","planet.fromraw(positiontofind","planet.uranu","planet.venus的原始值是2","player","player(coin","player(nam","player.completedlevel(1","player.tracker.advancetolevel(6","playernam","playeron","playerone!.coinsinpurs","playerone!.wincoins(2_000","playerone变量设置为nil，意思是“没有player实例”。当这种情况发生的时候，playerone变量对player实例的引用被破坏了。没有其它属性或者变量引用play","playerone是可选的，所以由一个感叹号（!）来修饰，每当其wincoins方法被调用时，coinsinpurs","player实例存储在一个名为playerone的可选play","player类使用leveltrack","player类创建一个新的leveltracker实例来监测这个用户的发展进度。他提供了completedlevel方法：一旦玩家完成某个指定等级就调用它。这个方法为所有玩家解锁下一等级，并且将当前玩家的进度更新为下一等级。（我们忽略了advancetolevel返回的布尔值，因为之前调用leveltracker.unlocklevel","player类定义了一个wincoins方法，该方法从银行获取一定数量的硬币，并把它们添加到玩家的钱包。player类还实现了一个析构函数，这个析构函数在play","pleas","plu","plusminusvector","plusthre","pm","point","point(x","point.0","point.1","pointonefouronefivenin","point封装了一个(x","point来引用元组(int","point来表示square的中心点。如代码所示，它正确返回了中心点(5","point结构体定义了一个变异方法（mut","point（x","pop","pop并移除值&quot;cuatro&quot","pop方法的返回值，该返回值将是一个t","posit","positiontofind","possibl","possibleinteg","possibleintegervalu","possiblenumb","possiblenumber.toint","possiblenumber.toint返回的可选int包含一个值，创建一个叫做actualnumb","possibleplanet","possiblestr","postfix","postfix-express","postfix-expression­.­decimal-digit","postfix-expression­.­dynamictyp","postfix-expression­.­identifier­generic-argument-clause(opt","postfix-expression­.­init","postfix-expression­.­self","postfix-expression­[­expression-list","postfix-expression­parenthesized-express","postfix-expression­parenthesized-expression­(opt)­trailing-closur","postfix-expression­postfix-oper","postfix-oper","postfix-operator-declar","postfix-self-express","potentialoverflow","powder","power","pp-prog","pp-prog告诉我，这几天太累了，校对到一半睡着了，醒来又继续做。2点17","preced","precedence-claus","precedence-clause­opt­associativity-clause­opt","precedence-level","precedence­precedence-level","precedence并优先级(preced","prefix","prefix-express","prefix-expression­binary-expressions(opt","prefix-oper","prefix-operator-declar","prefix存在时，将prefix插入到name之前来为starship构建fullnam","prefix）表达式，二元（binary）表达式，主要（primary）表达式和后缀（postfix）表达式。表达式可以返回一个值，以及运行某些逻辑（caus","preslei","prettytextrepresent","prettytextrepresentable协议的同时，也需要遵循textrepresent","prettytextrepresentable协议继承了textrepresent","primari","primary-express","prime","print","print(\"\\(codeunit","print(\"\\(scalar.valu","print(\"\\n","print(\"conson","print(\"oth","print(\"vowel","printandcount","printandcount(\"hello","printandcount(stringtoprint","printclassnam","printhelloworld","printletterkinds(\"hello","printletterkinds(word","printletterkinds的输入是一个string值并对其字符进行迭代。在每次迭代过程中，考虑当前字符的kind计算属性，并打印出合适的类别描述。所以printletterkinds就可以用来打印一个完整单词中所有字母的类型，正如上述单词&quot;hello&quot","println","println(\"'\\\\(word","println(\"(0","println(\"(\\(point.0","println(\"(\\(somepoint.0","println(\"(\\(x","println(\"3的6倍是\\(threetimestable[6","println(\"\\(airportcod","println(\"\\(animalname)","println(\"\\(bas","println(\"\\(country.name)'","println(\"\\(currentvalu","println(\"\\(index","println(\"\\(mansioncount","println(\"\\(nam","println(\"\\(possiblenumb","println(\"\\(scalar","println(\"\\(somecharact","println(\"\\(total.vowel","println(\"a","println(\"about","println(\"access","println(\"ad","println(\"airport","printl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\ No newline at end of file
diff --git a/source/chapter2/05_Control_Flow.md b/source/chapter2/05_Control_Flow.md
index 60d4140a..82d3a5bb 100644
--- a/source/chapter2/05_Control_Flow.md
+++ b/source/chapter2/05_Control_Flow.md
@@ -66,7 +66,7 @@ println("\(base) to the power of \(power) is \(answer)")
 // 输出 "3 to the power of 10 is 59049"
 ```
 
-这个例子计算 base 这个数的 power 次幂（本例中，是`3`的`10`次幂），从`1`（`3`的`0`次幂）开始做`3`的乘法， 进行`10`次，使用`1`到`10`的半闭区间循环。这个计算并不需要知道每一次循环中计数器具体的值，只需要执行了正确的循环次数即可。下划线符号`_`（替代循环中的变量）能够忽略具体的值，并且不提供循环遍历时对值的访问。
+这个例子计算 base 这个数的 power 次幂（本例中，是`3`的`10`次幂），从`1`（`3`的`0`次幂）开始做`3`的乘法， 进行`10`次，使用`1`到`10`的闭区间循环。这个计算并不需要知道每一次循环中计数器具体的值，只需要执行了正确的循环次数即可。下划线符号`_`（替代循环中的变量）能够忽略具体的值，并且不提供循环遍历时对值的访问。
 
 使用`for-in`遍历一个数组所有元素：