diff --git a/chapter1/README.html b/chapter1/README.html
index 66795c72..e412dde2 100644
--- a/chapter1/README.html
+++ b/chapter1/README.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1" data-basepath=".." data-revision="1401890107706">
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@@ -218,7 +218,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_6">
+                    <section class="normal" id="section-gitbook_13">
                     
                         <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/chapter1/a_swift_tour.html b/chapter1/a_swift_tour.html
index 885bfcf7..23ca8756 100644
--- a/chapter1/a_swift_tour.html
+++ b/chapter1/a_swift_tour.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1.2" data-basepath=".." data-revision="1401890107706">
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@@ -218,7 +218,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_7">
+                    <section class="normal" id="section-gitbook_14">
                     
                         <h1 id="swift-">Swift 初见</h1>
 <p>通常来说，编程语言教程中的第一个程序应该在屏幕上打印“Hello, world”。在 Swift 中，可以用一行代码实现：</p>
diff --git a/chapter1/swift.html b/chapter1/swift.html
index e1c1332f..9a7c7e8c 100644
--- a/chapter1/swift.html
+++ b/chapter1/swift.html
@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="1.1" data-basepath=".." data-revision="1401890107706">
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@@ -218,7 +218,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_8">
+                    <section class="normal" id="section-gitbook_15">
                     
                         <h1 id="-swift">关于 Swift</h1>
 <p>Swift 是一种新的编程语言，用于编写 iOS 和 OS X 应用程序。Swift 结合了 C 和 Objective-C 的优点并且不受C的兼容性的限制。Swift 使用安全的编程模式并添加了很多新特性，这将使编程更简单，扩展性更强，也更有趣。除此之外，Swift 还支持人见人爱的 Cocoa 和 Cocoa Touch 框架。拥有了这些特性，Swift将重新定义软件开发。</p>
diff --git a/chapter2/article_1.html b/chapter2/article_1.html
index ff7c564d..eb31b118 100644
--- a/chapter2/article_1.html
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@@ -44,7 +44,7 @@
 
 
         
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@@ -216,14 +216,14 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_9">
+                    <section class="normal" id="section-gitbook_16">
                     
                         <h1 id="-">基础部分</h1>
 <p>Swift 是 iOS 和 OS X 应用开发的一门新语言。然而，如果你有 C 或者 Objective-C 开发经验的话，你会发现 Swift 的很多内容都是你熟悉的。</p>
 <p>Swift 的类型是在 C 和 Objective-C 的基础上提出的，<code>Int</code>是整型；<code>Double</code>和<code>Float</code>是浮点型；<code>Bool</code>是布尔型；<code>String</code>是字符串。Swift 还有两个有用的集合类型，<code>Array</code>和<code>Dictionary</code>，详情参见<code>集合类型(待添加链接)</code>。</p>
 <p>就像 C 语言一样，Swift 使用变量来进行存储并通过变量名来关联值。在 Swift 中，值不可变的变量有着广泛的应用，它们就是常量，而且比 C 语言的常量更强大。在 Swift 中，如果你要处理的值不需要改变，那使用常量可以让你的代码更加安全并且更好地表达你的意图。</p>
 <p>除了我们熟悉的类型，Swift 还增加了 Objective-C 中没有的类型比如元组（Tuple）。元组可以让你创建或者传递一组数据，比如作为函数的返回值时，你可以用一个元组可以返回多个值。</p>
-<p>Swift 还增加了可选（Optional）类型，用于处理值缺失的情况。可选表示“那儿有一个值，并且它等于 x”或者“那儿没有值”。可选有点像在 Objective-C 中使用<code>nil</code>，但是它可以用在任何类型上，不仅仅是类。可选类型比 Objective-C 中的<code>nil</code>指针更加安全也更具表现力，它是 Swift 许多强大特性的重要组成部分。</p>
+<p>Swift 还增加了可选（Optional）类型，用于处理值缺失的情况。可选表示“那儿有一个值，并且它等于 x ”或者“那儿没有值”。可选有点像在 Objective-C 中使用<code>nil</code>，但是它可以用在任何类型上，不仅仅是类。可选类型比 Objective-C 中的<code>nil</code>指针更加安全也更具表现力，它是 Swift 许多强大特性的重要组成部分。</p>
 <p>Swift 是一个类型安全的语言，可选就是一个很好的例子。Swift 可以让你清楚地知道值的类型。如果你的代码期望得到一个<code>String</code>，类型安全会阻止你不小心传入一个<code>Int</code>。你可以在开发阶段尽早发现并修正错误。</p>
 <h2 id="-">常量和变量</h2>
 <p>常量和变量把一个名字（比如<code>maximumNumberOfLoginAttempts</code>或者<code>welcomeMessage</code>）和一个指定类型的值（比如数字<code>10</code>或者字符串<code>Hello</code>）联系起来。常量的值一旦设定就不能改变，而变量的值可以随意更改。</p>
@@ -252,7 +252,14 @@ var currentLoginAttempt = 0
 <p>注意：一般来说你很少需要写类型标注。如果你在声明常量或者变量的时候赋了一个初始值，Swift可以推断出这个常量或者变量的类型，详情参见<code>类型安全和类型推断(待添加链接)</code>。在上面的例子中，没有给<code>welcomeMessage</code>赋初始值，所以添加了一个类型标注。</p>
 </blockquote>
 <h3 id="-">常量和变量的命名</h3>
-<p>（未完）</p>
+<p>你可以用任何你喜欢的字符作为常量和变量名，包括Unicode字符：</p>
+<pre><code>    let π = 3.14159
+    let 你好 = &quot;你好世界&quot;
+</code></pre><p>常量与变量名不能包含数学符号，箭头，保留的(或者非法的)Unicode码位，连线与制表符。尽管常量与变量名中可以包含数字，但是它们不能以数字打头。</p>
+<p>一旦你将常量或者变量声明为确定的类型，你就不能使用相同的名字再次进行声明，或者以改变其存储的值为其他类型。同时，你也不能将常量与变量进行互转。</p>
+<blockquote>
+<p>注意：如果你需要使用与Swift保留关键字相同的名称作为常量或者变量名，你可以使用反引号(`)将关键字围住的方式将其作为名字使用。无论如何，你应当避免使用关键字作为常量或变量名，除非你别无选择。</p>
+</blockquote>
 
                     
                     </section>
diff --git a/chapter2/the_basics.html b/chapter2/the_basics.html
index 830418d7..2d1e38fd 100644
--- a/chapter2/the_basics.html
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@@ -46,7 +46,7 @@
 
 
         
-    <div class="book"  data-level="2" data-basepath=".." data-revision="1401890107706">
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     <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
@@ -218,7 +218,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_10">
+                    <section class="normal" id="section-gitbook_17">
                     
                         <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/index.html b/index.html
index 51b006c6..8f0db405 100644
--- a/index.html
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@@ -44,7 +44,7 @@
 
 
         
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@@ -216,7 +216,7 @@
 
                 <div class="page-inner">
                 
-                    <section class="normal" id="section-gitbook_5">
+                    <section class="normal" id="section-gitbook_12">
                     
                         <h1 id="swift-">Swift 编程语言</h1>
 <p>Swift 是苹果在 WWDC 2014 上发布的一款全新的编程语言，本书译自苹果官方的 Swift 教程《The Swift Programming Language》。</p>
@@ -267,5 +267,4 @@ require(["gitbook"], function(gitbook) {
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 </html>
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