diff --git a/source/.gitignore b/source/.gitignore
new file mode 100644
index 00000000..7e9471d0
--- /dev/null
+++ b/source/.gitignore
@@ -0,0 +1,4 @@
+_book
+*.pdf
+*.epub
+*.mobi
diff --git a/source/SUMMARY.md b/source/SUMMARY.md
index c218a9e3..73d88663 100755
--- a/source/SUMMARY.md
+++ b/source/SUMMARY.md
@@ -1,47 +1,49 @@
 # Summary
 
+* [Introduction](README.md)
 * 欢迎使用 Swift
-   * [关于 Swift](chapter1/01_about_swift.md)
-   * [版本兼容性](chapter1/02_version_compatibility.md)
-   * [Swift 初见](chapter1/03_a_swift_tour.md)
-   * [Swift 版本历史记录](chapter1/04_revision_history.md)
+    * [关于 Swift](chapter1/01_about_swift.md)
+    * [版本兼容性](chapter1/02_version_compatibility.md)
+    * [Swift 初见](chapter1/03_a_swift_tour.md)
+    * [Swift 版本历史记录](chapter1/04_revision_history.md)
 * Swift 教程
-   * [基础部分](chapter2/01_The_Basics.md)
-   * [基本运算符](chapter2/02_Basic_Operators.md)
-   * [字符串和字符](chapter2/03_Strings_and_Characters.md)
-   * [集合类型](chapter2/04_Collection_Types.md)
-   * [控制流](chapter2/05_Control_Flow.md)
-   * [函数](chapter2/06_Functions.md)
-   * [闭包](chapter2/07_Closures.md)
-   * [枚举](chapter2/08_Enumerations.md)
-   * [类和结构体](chapter2/09_Structures_And_Classes.md)
-   * [属性](chapter2/10_Properties.md)
-   * [方法](chapter2/11_Methods.md)
-   * [下标](chapter2/12_Subscripts.md)
-   * [继承](chapter2/13_Inheritance.md)
-   * [构造过程](chapter2/14_Initialization.md)
-   * [析构过程](chapter2/15_Deinitialization.md)
-   * [可选链](chapter2/16_Optional_Chaining.md)
-   * [错误处理](chapter2/17_Error_Handling.md)
-   * [类型转换](chapter2/18_Type_Casting.md)
-   * [嵌套类型](chapter2/19_Nested_Types.md)
-   * [扩展](chapter2/20_Extensions.md)
-   * [协议](chapter2/21_Protocols.md)
-   * [泛型](chapter2/22_Generics.md)
-   * [自动引用计数](chapter2/23_Automatic_Reference_Counting.md)
-   * [内存安全](chapter2/24_Memory_Safety.md)
-   * [访问控制](chapter2/25_Access_Control.md)
-   * [高级运算符](chapter2/26_Advanced_Operators.md)
+    * [基础部分](chapter2/01_The_Basics.md)
+    * [基本运算符](chapter2/02_Basic_Operators.md)
+    * [字符串和字符](chapter2/03_Strings_and_Characters.md)
+    * [集合类型](chapter2/04_Collection_Types.md)
+    * [控制流](chapter2/05_Control_Flow.md)
+    * [函数](chapter2/06_Functions.md)
+    * [闭包](chapter2/07_Closures.md)
+    * [枚举](chapter2/08_Enumerations.md)
+    * [类和结构体](chapter2/09_Structures_And_Classes.md)
+    * [属性](chapter2/10_Properties.md)
+    * [方法](chapter2/11_Methods.md)
+    * [下标](chapter2/12_Subscripts.md)
+    * [继承](chapter2/13_Inheritance.md)
+    * [构造过程](chapter2/14_Initialization.md)
+    * [析构过程](chapter2/15_Deinitialization.md)
+    * [可选链](chapter2/16_Optional_Chaining.md)
+    * [错误处理](chapter2/17_Error_Handling.md)
+    * [类型转换](chapter2/18_Type_Casting.md)
+    * [嵌套类型](chapter2/19_Nested_Types.md)
+    * [扩展](chapter2/20_Extensions.md)
+    * [协议](chapter2/21_Protocols.md)
+    * [泛型](chapter2/22_Generics.md)
+    * [自动引用计数](chapter2/23_Automatic_Reference_Counting.md)
+    * [内存安全](chapter2/24_Memory_Safety.md)
+    * [访问控制](chapter2/25_Access_Control.md)
+    * [高级运算符](chapter2/26_Advanced_Operators.md)
 * 语言参考
-   * [关于语言参考](chapter3/01_About_the_Language_Reference.md)
-   * [词法结构](chapter3/02_Lexical_Structure.md)
-   * [类型](chapter3/03_Types.md)
-   * [表达式](chapter3/04_Expressions.md)
-   * [语句](chapter3/05_Statements.md)
-   * [声明](chapter3/06_Declarations.md)
-   * [特性](chapter3/07_Attributes.md)
-   * [模式](chapter3/08_Patterns.md)
-   * [泛型参数](chapter3/09_Generic_Parameters_and_Arguments.md)
-   * [语法总结](chapter3/10_Summary_of_the_Grammar.md)
+    * [关于语言参考](chapter3/01_About_the_Language_Reference.md)
+    * [词法结构](chapter3/02_Lexical_Structure.md)
+    * [类型](chapter3/03_Types.md)
+    * [表达式](chapter3/04_Expressions.md)
+    * [语句](chapter3/05_Statements.md)
+    * [声明](chapter3/06_Declarations.md)
+    * [特性](chapter3/07_Attributes.md)
+    * [模式](chapter3/08_Patterns.md)
+    * [泛型参数](chapter3/09_Generic_Parameters_and_Arguments.md)
+    * [语法总结](chapter3/10_Summary_of_the_Grammar.md)
 * 翻译贡献者
-  * [翻译贡献者](contributors.md)
+    * [翻译贡献者](contributors.md)
+