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diff --git a/Readme.md b/Readme.md
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--- a/Readme.md
+++ b/Readme.md
@@ -1 +1,28 @@
 # Rust exercise
+Greetings and welcome to `exercise.rs`，here you can find bunch of easy to hard exercises to improve your Rust skills，this will help you fill the gap of easy-to-learn and hard-to-use.
+
+## Online Reading
+This book is written in English and Chinese, you can pick up the language you are familiar with:
+- English: [https://exercise.rs](https://exercise.rs)
+- 简体中文: [https://zh.exercise.rs](https://zh.=[exercise.rs)
+
+## Learning Rust
+If you are a first-time Rust learner, here are some high quality learning resources :
+- [The Book](https://doc.rust-lang.org/book/index.html) for English  speakers
+- [Rust语言圣经(The Course)](https://course.rs) for Chinese speakers, it covers nearly all the topics in Rust
+
+
+## difference to rustlings
+[Rustlings](https://github.com/rust-lang/rustlings) only contains small and easy exercises for junior rust devs. There is a big gap between learning Rust and using it in your projects.
+
+Another limit for rustlings is that you have to download rustlings to local machine and compile it first before starting to learn.
+
+## difference to rust by example
+[Rust By Example](https://doc.rust-lang.org/stable/rust-by-example/) is an excellent online book for learning Rust，`exercise.rs` has some small advantages in :
+
+- more topics and exercises，specially for the hard part of Rust，e.g lifetime、smart pointers、threads 、async/.await etc
+- difficulty from easy to hard，it will minimize the gap between learning and using in projects
+- up-to-date, e.g features which added in Rust 1.58 also have the corresponding exercises in `exercise.rs`
+- Both `course.rs` and `exercise.rs` are designed according to the CS courses in college，so quliaty is the most important factor
+
+
diff --git a/.gitignore b/en/.gitignore
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diff --git a/assets/CNAME b/en/assets/CNAME
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diff --git a/book.toml b/en/book.toml
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+++ b/en/book.toml
@@ -10,10 +10,11 @@ editor = "ace"
 
 [output.html.fold]
 enable = true
+level = 1
 
 [output.html]
 git-repository-url = "https://github.com/sunface/rust-exercise"
-edit-url-template = "https://github.com/sunface/rust-exercise/edit/master/{path}"
+edit-url-template = "https://github.com/sunface/rust-exercise/edit/master/en/{path}"
 
 [rust]
 edition = "2021"
\ No newline at end of file
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diff --git a/zh-CN/.gitignore b/zh-CN/.gitignore
new file mode 100644
index 0000000..7585238
--- /dev/null
+++ b/zh-CN/.gitignore
@@ -0,0 +1 @@
+book
diff --git a/zh-CN/assets/CNAME b/zh-CN/assets/CNAME
new file mode 100644
index 0000000..2c5ea12
--- /dev/null
+++ b/zh-CN/assets/CNAME
@@ -0,0 +1 @@
+exercise.rs
\ No newline at end of file
diff --git a/zh-CN/book.toml b/zh-CN/book.toml
new file mode 100644
index 0000000..75b13d7
--- /dev/null
+++ b/zh-CN/book.toml
@@ -0,0 +1,20 @@
+[book]
+title = "Rust Exercise"
+description = "A set of exercises and examples to pratice various aspects of Rust, also for the rust course (book) at https://course.rs"
+authors = ["sunface, https://im.dev"]
+language = "en"
+
+[output.html.playpen]
+editable = true
+editor = "ace"
+
+[output.html.fold]
+enable = true
+level = 1
+
+[output.html]
+git-repository-url = "https://github.com/sunface/rust-exercise"
+edit-url-template = "https://github.com/sunface/rust-exercise/edit/master/zh-CN/{path}"
+
+[rust]
+edition = "2021"
\ No newline at end of file
diff --git a/zh-CN/deploy b/zh-CN/deploy
new file mode 100755
index 0000000..c1c7896
--- /dev/null
+++ b/zh-CN/deploy
@@ -0,0 +1,21 @@
+## this script deploys the static website of course.rs to github pages
+
+## build static website for book
+mdbook build
+## copy CNAME info to book dir
+cp ./assets/CNAME ./book/
+cp ./assets/*.html ./book/
+cp ./assets/sitemap.xml ./book/
+
+## init git repo
+cd book
+git init
+git config user.name "sunface"
+git config user.email "cto@188.com"
+git add .
+git commit -m 'deploy'
+git branch -M gh-pages
+git remote add origin https://github.com/sunface/rust-exercise
+
+## push to github pages
+git push -u -f origin gh-pages
\ No newline at end of file
diff --git a/zh-CN/src/SUMMARY.md b/zh-CN/src/SUMMARY.md
new file mode 100644
index 0000000..e829ac1
--- /dev/null
+++ b/zh-CN/src/SUMMARY.md
@@ -0,0 +1,78 @@
+# Summary
+
+- [关于 exercise.rs](why-exercise.md)
+- [变量绑定与解构 todo](variables.md)
+- [基本类型 todo](basic-types/intro.md)
+  - [数值类型](basic-types/numbers.md)
+  - [字符、布尔、单元类型](basic-types/char-bool-unit.md)
+  - [语句与表达式](basic-types/statements-expressions.md)
+  - [函数](basic-types/functions.md)
+- [所有权和借用 todo](ownership/intro.md)
+  - [所有权](ownership/ownership.md)
+  - [引用和借用](ownership/borrowing.md)
+- [复合类型 todo](compound-types/intro.md)
+  - [字符串与切片](compound-types/string-slice.md)
+  - [元组](compound-types/tuple.md)
+  - [结构体](compound-types/struct.md)
+  - [枚举](compound-types/enum.md)
+  - [数组](compound-types/array.md)
+- [流程控制 todo](flow-control.md)
+- [模式匹配 todo](pattern-match/intro.md)
+  - [match 和 if let](pattern-match/match-iflet.md)
+  - [解构 Option](pattern-match/option.md)
+  - [模式](pattern-match/patterns.md)
+- [方法 Method todo](method.md)
+- [泛型和特征 todo](generics-traits/intro.md)
+  - [泛型 Generics](generics-traits/generics.md)
+  - [特征 Traits](generics-traits/traits.md)
+  - [特征对象](generics-traits/trait-object.md)
+  - [进一步深入特征](generics-traits/advance-traits.md)
+- [集合类型 todo](collections/intro.md)
+  - [动态数组 Vector](collections/vector.md)
+  - [KV 存储 HashMap](collections/hashmap.md)
+- [类型转换 todo](type-conversion.md)
+- [返回值和 panic! todo](result-panic/intro.md)
+  - [panic! 深入剖析](result-panic/panic.md)
+  - [返回值result 和 ?](result-panic/result.md)
+- [包和模块 todo](crate-module/intro.md)
+  - [包 Crate](crate-module/crate.md)
+  - [模块 Module](crate-module/module.md)
+  - [使用use引入模块及受限可见性](crate-module/use-pub.md)
+- [注释和文档 todo](comments-docs.md)
+- [格式化输出 todo](formatted-output.md)
+- [生命周期 todo](lifetime/intro.md)
+  - [生命周期基础](lifetime/basic.md)
+  - [&'static 和 T: 'static](lifetime/static.md)
+  - [深入生命周期](lifetime/advance.md)
+- [函数式编程: 闭包、迭代器 todo](functional-programing/intro.md)
+  - [闭包 Closure](functional-programing/cloure.md)
+  - [迭代器 Iterator](functional-programing/iterator.md)
+- [newtype 和 Sized todo](newtype-sized.md)
+- [智能指针 todo](smart-pointers/intro.md)
+  - [Box](smart-pointers/box.md)
+  - [Deref](smart-pointers/deref.md)
+  - [Drop](smart-pointers/drop.md)
+  - [Rc and Arc](smart-pointers/rc-arc.md)
+  - [Cell and RefCell](smart-pointers/cell-refcell.md)
+- [Weak 和循环引用todo](weak.md)
+- [自引用 todo](self-referential.md)
+- [多线程 todo](threads/intro.md)
+  - [多线程基础](threads/basic-using.md)
+  - [消息传递](threads/message-passing.md)
+  - [线程同步：锁、Condvar和信号量](threads/sync.md)
+  - [线程同步：Atomic](threads/atomic.md)
+  - [Send 和 Sync](threads/send-sync.md)
+- [全局变量 todo](global-variables.md)
+- [错误处理 todo](errors.md)
+- [unsafe todo](unsafe.md)
+- [macro 宏 todo](macro.md)
+- [测试 todo](tests/intro.md)
+  - [编写测试及控制执行](tests/write-tests.md)
+  - [基准性能测试 Benchmark](tests/benchmark.md)
+  - [单元测试及集成测试](tests/unit-integration.md)
+  - [断言 Assertions](tests/assertions.md)
+- [Async/Await 异步编程 todo](async/intro.md)
+  - [async 和 await!](async/async-await.md)
+  - [Future](async/future.md)
+  - [Pin 和 Unpin](async/pin-unpin.md)
+  - [Stream 流处理](async/stream.md)
diff --git a/zh-CN/src/async/async-await.md b/zh-CN/src/async/async-await.md
new file mode 100644
index 0000000..a20c0b8
--- /dev/null
+++ b/zh-CN/src/async/async-await.md
@@ -0,0 +1 @@
+# async and await!
diff --git a/zh-CN/src/async/future.md b/zh-CN/src/async/future.md
new file mode 100644
index 0000000..5f24b0e
--- /dev/null
+++ b/zh-CN/src/async/future.md
@@ -0,0 +1 @@
+# Future
diff --git a/zh-CN/src/async/intro.md b/zh-CN/src/async/intro.md
new file mode 100644
index 0000000..70bdb9f
--- /dev/null
+++ b/zh-CN/src/async/intro.md
@@ -0,0 +1 @@
+# Async/Await
diff --git a/zh-CN/src/async/pin-unpin.md b/zh-CN/src/async/pin-unpin.md
new file mode 100644
index 0000000..8655bd1
--- /dev/null
+++ b/zh-CN/src/async/pin-unpin.md
@@ -0,0 +1 @@
+# Pin and Unpin
diff --git a/zh-CN/src/async/stream.md b/zh-CN/src/async/stream.md
new file mode 100644
index 0000000..867bd88
--- /dev/null
+++ b/zh-CN/src/async/stream.md
@@ -0,0 +1 @@
+# Stream
diff --git a/zh-CN/src/basic-types/char-bool-unit.md b/zh-CN/src/basic-types/char-bool-unit.md
new file mode 100644
index 0000000..b406dee
--- /dev/null
+++ b/zh-CN/src/basic-types/char-bool-unit.md
@@ -0,0 +1 @@
+# Char, Bool and Unit
diff --git a/zh-CN/src/basic-types/functions.md b/zh-CN/src/basic-types/functions.md
new file mode 100644
index 0000000..0c5faf5
--- /dev/null
+++ b/zh-CN/src/basic-types/functions.md
@@ -0,0 +1 @@
+# Functions
diff --git a/zh-CN/src/basic-types/intro.md b/zh-CN/src/basic-types/intro.md
new file mode 100644
index 0000000..2d47759
--- /dev/null
+++ b/zh-CN/src/basic-types/intro.md
@@ -0,0 +1 @@
+# Basic Types
diff --git a/zh-CN/src/basic-types/numbers.md b/zh-CN/src/basic-types/numbers.md
new file mode 100644
index 0000000..bbdcf5e
--- /dev/null
+++ b/zh-CN/src/basic-types/numbers.md
@@ -0,0 +1 @@
+# Numbers
diff --git a/zh-CN/src/basic-types/statements-expressions.md b/zh-CN/src/basic-types/statements-expressions.md
new file mode 100644
index 0000000..d1f2555
--- /dev/null
+++ b/zh-CN/src/basic-types/statements-expressions.md
@@ -0,0 +1 @@
+# Statements and Expressions
diff --git a/zh-CN/src/circle-refer b/zh-CN/src/circle-refer
new file mode 100644
index 0000000..04b7a8f
--- /dev/null
+++ b/zh-CN/src/circle-refer
@@ -0,0 +1 @@
+# Weak and Circle reference
diff --git a/zh-CN/src/circle-reference/intro.md b/zh-CN/src/circle-reference/intro.md
new file mode 100644
index 0000000..4f99ca5
--- /dev/null
+++ b/zh-CN/src/circle-reference/intro.md
@@ -0,0 +1 @@
+# Circle reference and Self referential
diff --git a/zh-CN/src/collections/hashmap.md b/zh-CN/src/collections/hashmap.md
new file mode 100644
index 0000000..96e549d
--- /dev/null
+++ b/zh-CN/src/collections/hashmap.md
@@ -0,0 +1 @@
+# HashMap
diff --git a/zh-CN/src/collections/intro.md b/zh-CN/src/collections/intro.md
new file mode 100644
index 0000000..1bdd607
--- /dev/null
+++ b/zh-CN/src/collections/intro.md
@@ -0,0 +1 @@
+# Collection Types
diff --git a/zh-CN/src/collections/vector.md b/zh-CN/src/collections/vector.md
new file mode 100644
index 0000000..a2303c1
--- /dev/null
+++ b/zh-CN/src/collections/vector.md
@@ -0,0 +1 @@
+# Vector
diff --git a/zh-CN/src/comments-docs.md b/zh-CN/src/comments-docs.md
new file mode 100644
index 0000000..cb7d70d
--- /dev/null
+++ b/zh-CN/src/comments-docs.md
@@ -0,0 +1 @@
+# Comments and Docs
diff --git a/zh-CN/src/compound-types/array.md b/zh-CN/src/compound-types/array.md
new file mode 100644
index 0000000..92c587c
--- /dev/null
+++ b/zh-CN/src/compound-types/array.md
@@ -0,0 +1 @@
+# array
diff --git a/zh-CN/src/compound-types/enum.md b/zh-CN/src/compound-types/enum.md
new file mode 100644
index 0000000..298e31d
--- /dev/null
+++ b/zh-CN/src/compound-types/enum.md
@@ -0,0 +1 @@
+# enum
diff --git a/zh-CN/src/compound-types/intro.md b/zh-CN/src/compound-types/intro.md
new file mode 100644
index 0000000..0c35451
--- /dev/null
+++ b/zh-CN/src/compound-types/intro.md
@@ -0,0 +1 @@
+# Compound Types
diff --git a/zh-CN/src/compound-types/string-slice.md b/zh-CN/src/compound-types/string-slice.md
new file mode 100644
index 0000000..9f17363
--- /dev/null
+++ b/zh-CN/src/compound-types/string-slice.md
@@ -0,0 +1 @@
+# string and slice
diff --git a/zh-CN/src/compound-types/struct.md b/zh-CN/src/compound-types/struct.md
new file mode 100644
index 0000000..4b9489b
--- /dev/null
+++ b/zh-CN/src/compound-types/struct.md
@@ -0,0 +1 @@
+# struct
diff --git a/zh-CN/src/compound-types/tuple.md b/zh-CN/src/compound-types/tuple.md
new file mode 100644
index 0000000..ebbc1a7
--- /dev/null
+++ b/zh-CN/src/compound-types/tuple.md
@@ -0,0 +1 @@
+# tuple
diff --git a/zh-CN/src/crate b/zh-CN/src/crate
new file mode 100644
index 0000000..e66fb06
--- /dev/null
+++ b/zh-CN/src/crate
@@ -0,0 +1 @@
+# Crate
diff --git a/zh-CN/src/crate-module/crate.md b/zh-CN/src/crate-module/crate.md
new file mode 100644
index 0000000..e66fb06
--- /dev/null
+++ b/zh-CN/src/crate-module/crate.md
@@ -0,0 +1 @@
+# Crate
diff --git a/zh-CN/src/crate-module/intro.md b/zh-CN/src/crate-module/intro.md
new file mode 100644
index 0000000..dadbf20
--- /dev/null
+++ b/zh-CN/src/crate-module/intro.md
@@ -0,0 +1 @@
+# Crate and module
diff --git a/zh-CN/src/crate-module/module.md b/zh-CN/src/crate-module/module.md
new file mode 100644
index 0000000..b785ceb
--- /dev/null
+++ b/zh-CN/src/crate-module/module.md
@@ -0,0 +1 @@
+# Module
diff --git a/zh-CN/src/crate-module/use-pub.md b/zh-CN/src/crate-module/use-pub.md
new file mode 100644
index 0000000..60c6894
--- /dev/null
+++ b/zh-CN/src/crate-module/use-pub.md
@@ -0,0 +1 @@
+# use and pub
diff --git a/zh-CN/src/errors.md b/zh-CN/src/errors.md
new file mode 100644
index 0000000..165d08c
--- /dev/null
+++ b/zh-CN/src/errors.md
@@ -0,0 +1 @@
+# Errors
diff --git a/zh-CN/src/flow-control.md b/zh-CN/src/flow-control.md
new file mode 100644
index 0000000..cf0c99f
--- /dev/null
+++ b/zh-CN/src/flow-control.md
@@ -0,0 +1 @@
+# Flow Control
diff --git a/zh-CN/src/formatted-output.md b/zh-CN/src/formatted-output.md
new file mode 100644
index 0000000..5cd8a3b
--- /dev/null
+++ b/zh-CN/src/formatted-output.md
@@ -0,0 +1 @@
+# Formatted output
diff --git a/zh-CN/src/functional-programing/cloure.md b/zh-CN/src/functional-programing/cloure.md
new file mode 100644
index 0000000..fb73740
--- /dev/null
+++ b/zh-CN/src/functional-programing/cloure.md
@@ -0,0 +1,51 @@
+# Closure
+
+下面代码是Rust圣经课程中[闭包](http://course.rs/advance/functional-programing/closure.html#结构体中的闭包)章节的课内练习题答案：
+
+```rust
+struct Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    query: T,
+    value: Option<E>,
+}
+
+impl<T,E> Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    fn new(query: T) -> Cacher<T,E> {
+        Cacher {
+            query,
+            value: None,
+        }
+    }
+
+    fn value(&mut self, arg: E) -> E {
+        match self.value {
+            Some(v) => v,
+            None => {
+                let v = (self.query)(arg);
+                self.value = Some(v);
+                v
+            }
+        }
+    }
+}
+fn main() {
+  
+}
+
+#[test]
+fn call_with_different_values() {
+    let mut c = Cacher::new(|a| a);
+
+    let v1 = c.value(1);
+    let v2 = c.value(2);
+
+    assert_eq!(v2, 1);
+}
+```
\ No newline at end of file
diff --git a/zh-CN/src/functional-programing/intro.md b/zh-CN/src/functional-programing/intro.md
new file mode 100644
index 0000000..6f326b8
--- /dev/null
+++ b/zh-CN/src/functional-programing/intro.md
@@ -0,0 +1 @@
+# Functional programing
diff --git a/zh-CN/src/functional-programing/iterator.md b/zh-CN/src/functional-programing/iterator.md
new file mode 100644
index 0000000..2a4a2aa
--- /dev/null
+++ b/zh-CN/src/functional-programing/iterator.md
@@ -0,0 +1 @@
+# Iterator
diff --git a/zh-CN/src/functional-programming/closure.md b/zh-CN/src/functional-programming/closure.md
new file mode 100644
index 0000000..fb73740
--- /dev/null
+++ b/zh-CN/src/functional-programming/closure.md
@@ -0,0 +1,51 @@
+# Closure
+
+下面代码是Rust圣经课程中[闭包](http://course.rs/advance/functional-programing/closure.html#结构体中的闭包)章节的课内练习题答案：
+
+```rust
+struct Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    query: T,
+    value: Option<E>,
+}
+
+impl<T,E> Cacher<T,E>
+where
+    T: Fn(E) -> E,
+    E: Copy
+{
+    fn new(query: T) -> Cacher<T,E> {
+        Cacher {
+            query,
+            value: None,
+        }
+    }
+
+    fn value(&mut self, arg: E) -> E {
+        match self.value {
+            Some(v) => v,
+            None => {
+                let v = (self.query)(arg);
+                self.value = Some(v);
+                v
+            }
+        }
+    }
+}
+fn main() {
+  
+}
+
+#[test]
+fn call_with_different_values() {
+    let mut c = Cacher::new(|a| a);
+
+    let v1 = c.value(1);
+    let v2 = c.value(2);
+
+    assert_eq!(v2, 1);
+}
+```
\ No newline at end of file
diff --git a/zh-CN/src/functional-programming/intro.md b/zh-CN/src/functional-programming/intro.md
new file mode 100644
index 0000000..dca041e
--- /dev/null
+++ b/zh-CN/src/functional-programming/intro.md
@@ -0,0 +1 @@
+# Functional Programming
diff --git a/zh-CN/src/generics-traits/advance-traits.md b/zh-CN/src/generics-traits/advance-traits.md
new file mode 100644
index 0000000..8cd2f63
--- /dev/null
+++ b/zh-CN/src/generics-traits/advance-traits.md
@@ -0,0 +1 @@
+# Advance Traits
diff --git a/zh-CN/src/generics-traits/generics.md b/zh-CN/src/generics-traits/generics.md
new file mode 100644
index 0000000..292d26b
--- /dev/null
+++ b/zh-CN/src/generics-traits/generics.md
@@ -0,0 +1 @@
+# Generics
diff --git a/zh-CN/src/generics-traits/intro.md b/zh-CN/src/generics-traits/intro.md
new file mode 100644
index 0000000..340ad0e
--- /dev/null
+++ b/zh-CN/src/generics-traits/intro.md
@@ -0,0 +1 @@
+# Generics and Traits
diff --git a/zh-CN/src/generics-traits/trait-object.md b/zh-CN/src/generics-traits/trait-object.md
new file mode 100644
index 0000000..38a0b34
--- /dev/null
+++ b/zh-CN/src/generics-traits/trait-object.md
@@ -0,0 +1 @@
+# Trait Object
diff --git a/zh-CN/src/generics-traits/traits.md b/zh-CN/src/generics-traits/traits.md
new file mode 100644
index 0000000..445d444
--- /dev/null
+++ b/zh-CN/src/generics-traits/traits.md
@@ -0,0 +1 @@
+# Traits
diff --git a/zh-CN/src/global-variables.md b/zh-CN/src/global-variables.md
new file mode 100644
index 0000000..ad85421
--- /dev/null
+++ b/zh-CN/src/global-variables.md
@@ -0,0 +1 @@
+# Global variables
diff --git a/zh-CN/src/lifetime/advance.md b/zh-CN/src/lifetime/advance.md
new file mode 100644
index 0000000..4ee0e07
--- /dev/null
+++ b/zh-CN/src/lifetime/advance.md
@@ -0,0 +1 @@
+# advance
diff --git a/zh-CN/src/lifetime/basic.md b/zh-CN/src/lifetime/basic.md
new file mode 100644
index 0000000..40439f4
--- /dev/null
+++ b/zh-CN/src/lifetime/basic.md
@@ -0,0 +1,26 @@
+## 生命周期消除
+
+```rust
+fn print(s: &str);                                      // elided
+fn print<'a>(s: &'a str);                               // expanded
+
+fn debug(lvl: usize, s: &str);                          // elided
+fn debug<'a>(lvl: usize, s: &'a str);                   // expanded
+
+fn substr(s: &str, until: usize) -> &str;               // elided
+fn substr<'a>(s: &'a str, until: usize) -> &'a str;     // expanded
+
+fn get_str() -> &str;                                   // ILLEGAL
+
+fn frob(s: &str, t: &str) -> &str;                      // ILLEGAL
+
+fn get_mut(&mut self) -> &mut T;                        // elided
+fn get_mut<'a>(&'a mut self) -> &'a mut T;              // expanded
+
+fn args<T: ToCStr>(&mut self, args: &[T]) -> &mut Command                  // elided
+fn args<'a, 'b, T: ToCStr>(&'a mut self, args: &'b [T]) -> &'a mut Command // expanded
+
+fn new(buf: &mut [u8]) -> BufWriter;                    // elided
+fn new(buf: &mut [u8]) -> BufWriter<'_>;                // elided (with `rust_2018_idioms`)
+fn new<'a>(buf: &'a mut [u8]) -> BufWriter<'a>          // expanded
+```
\ No newline at end of file
diff --git a/zh-CN/src/lifetime/intro.md b/zh-CN/src/lifetime/intro.md
new file mode 100644
index 0000000..2615315
--- /dev/null
+++ b/zh-CN/src/lifetime/intro.md
@@ -0,0 +1 @@
+# Lifetime
diff --git a/zh-CN/src/lifetime/static.md b/zh-CN/src/lifetime/static.md
new file mode 100644
index 0000000..782446e
--- /dev/null
+++ b/zh-CN/src/lifetime/static.md
@@ -0,0 +1,49 @@
+# &'static and T: 'static
+
+```rust,editable
+use std::fmt::Display;
+
+fn main() {
+  let mut string = "First".to_owned();
+
+  string.push_str(string.to_uppercase().as_str());
+  print_a(&string);
+  print_b(&string);
+  print_c(&string); // Compilation error
+  print_d(&string); // Compilation error
+  print_e(&string);
+  print_f(&string);
+  print_g(&string); // Compilation error
+}
+
+fn print_a<T: Display + 'static>(t: &T) {
+  println!("{}", t);
+}
+
+fn print_b<T>(t: &T)
+where
+  T: Display + 'static,
+{
+  println!("{}", t);
+}
+
+fn print_c(t: &'static dyn Display) {
+  println!("{}", t)
+}
+
+fn print_d(t: &'static impl Display) {
+  println!("{}", t)
+}
+
+fn print_e(t: &(dyn Display + 'static)) {
+  println!("{}", t)
+}
+
+fn print_f(t: &(impl Display + 'static)) {
+  println!("{}", t)
+}
+
+fn print_g(t: &'static String) {
+  println!("{}", t);
+}
+```
\ No newline at end of file
diff --git a/zh-CN/src/macro.md b/zh-CN/src/macro.md
new file mode 100644
index 0000000..20503ba
--- /dev/null
+++ b/zh-CN/src/macro.md
@@ -0,0 +1 @@
+# macro
diff --git a/zh-CN/src/method.md b/zh-CN/src/method.md
new file mode 100644
index 0000000..81d5a1c
--- /dev/null
+++ b/zh-CN/src/method.md
@@ -0,0 +1 @@
+# Method
diff --git a/zh-CN/src/newtype-sized.md b/zh-CN/src/newtype-sized.md
new file mode 100644
index 0000000..fc3f074
--- /dev/null
+++ b/zh-CN/src/newtype-sized.md
@@ -0,0 +1 @@
+# newtype and Sized
diff --git a/zh-CN/src/ownership/borrowing.md b/zh-CN/src/ownership/borrowing.md
new file mode 100644
index 0000000..9ce0535
--- /dev/null
+++ b/zh-CN/src/ownership/borrowing.md
@@ -0,0 +1 @@
+# Reference and Borrowing
diff --git a/zh-CN/src/ownership/intro.md b/zh-CN/src/ownership/intro.md
new file mode 100644
index 0000000..e749a67
--- /dev/null
+++ b/zh-CN/src/ownership/intro.md
@@ -0,0 +1 @@
+# Ownership and Borrowing
diff --git a/zh-CN/src/ownership/ownership.md b/zh-CN/src/ownership/ownership.md
new file mode 100644
index 0000000..77f5a52
--- /dev/null
+++ b/zh-CN/src/ownership/ownership.md
@@ -0,0 +1 @@
+# Ownership
diff --git a/zh-CN/src/pattern-match/intro.md b/zh-CN/src/pattern-match/intro.md
new file mode 100644
index 0000000..ee4bb18
--- /dev/null
+++ b/zh-CN/src/pattern-match/intro.md
@@ -0,0 +1 @@
+# Pattern Match
diff --git a/zh-CN/src/pattern-match/match-iflet.md b/zh-CN/src/pattern-match/match-iflet.md
new file mode 100644
index 0000000..18eed0e
--- /dev/null
+++ b/zh-CN/src/pattern-match/match-iflet.md
@@ -0,0 +1 @@
+# match, if let
diff --git a/zh-CN/src/pattern-match/option.md b/zh-CN/src/pattern-match/option.md
new file mode 100644
index 0000000..cb5ffa1
--- /dev/null
+++ b/zh-CN/src/pattern-match/option.md
@@ -0,0 +1 @@
+# Option destructing
diff --git a/zh-CN/src/pattern-match/patterns.md b/zh-CN/src/pattern-match/patterns.md
new file mode 100644
index 0000000..3c9daa3
--- /dev/null
+++ b/zh-CN/src/pattern-match/patterns.md
@@ -0,0 +1 @@
+# Patterns
diff --git a/zh-CN/src/resu b/zh-CN/src/resu
new file mode 100644
index 0000000..b82dd9a
--- /dev/null
+++ b/zh-CN/src/resu
@@ -0,0 +1 @@
+# panic!
diff --git a/zh-CN/src/result-panic/intro.md b/zh-CN/src/result-panic/intro.md
new file mode 100644
index 0000000..f724a70
--- /dev/null
+++ b/zh-CN/src/result-panic/intro.md
@@ -0,0 +1 @@
+# Result and panic
diff --git a/zh-CN/src/result-panic/panic.md b/zh-CN/src/result-panic/panic.md
new file mode 100644
index 0000000..b82dd9a
--- /dev/null
+++ b/zh-CN/src/result-panic/panic.md
@@ -0,0 +1 @@
+# panic!
diff --git a/zh-CN/src/result-panic/result.md b/zh-CN/src/result-panic/result.md
new file mode 100644
index 0000000..7af6baf
--- /dev/null
+++ b/zh-CN/src/result-panic/result.md
@@ -0,0 +1 @@
+# result and ?
diff --git a/zh-CN/src/self-referential.md b/zh-CN/src/self-referential.md
new file mode 100644
index 0000000..37a4784
--- /dev/null
+++ b/zh-CN/src/self-referential.md
@@ -0,0 +1 @@
+# Self referential
diff --git a/zh-CN/src/smart-pointers/box.md b/zh-CN/src/smart-pointers/box.md
new file mode 100644
index 0000000..2436f01
--- /dev/null
+++ b/zh-CN/src/smart-pointers/box.md
@@ -0,0 +1 @@
+# Box
diff --git a/zh-CN/src/smart-pointers/cell-refcell.md b/zh-CN/src/smart-pointers/cell-refcell.md
new file mode 100644
index 0000000..4e61a02
--- /dev/null
+++ b/zh-CN/src/smart-pointers/cell-refcell.md
@@ -0,0 +1 @@
+# Cell and RefCell
diff --git a/zh-CN/src/smart-pointers/deref.md b/zh-CN/src/smart-pointers/deref.md
new file mode 100644
index 0000000..8c709e8
--- /dev/null
+++ b/zh-CN/src/smart-pointers/deref.md
@@ -0,0 +1 @@
+# Deref
diff --git a/zh-CN/src/smart-pointers/drop.md b/zh-CN/src/smart-pointers/drop.md
new file mode 100644
index 0000000..c6ecf82
--- /dev/null
+++ b/zh-CN/src/smart-pointers/drop.md
@@ -0,0 +1 @@
+# Drop
diff --git a/zh-CN/src/smart-pointers/intro.md b/zh-CN/src/smart-pointers/intro.md
new file mode 100644
index 0000000..997d50c
--- /dev/null
+++ b/zh-CN/src/smart-pointers/intro.md
@@ -0,0 +1 @@
+# Smart pointers
diff --git a/zh-CN/src/smart-pointers/rc-arc.md b/zh-CN/src/smart-pointers/rc-arc.md
new file mode 100644
index 0000000..8f723ed
--- /dev/null
+++ b/zh-CN/src/smart-pointers/rc-arc.md
@@ -0,0 +1 @@
+# Rc and Arc
diff --git a/zh-CN/src/tests/assertions.md b/zh-CN/src/tests/assertions.md
new file mode 100644
index 0000000..f5743ab
--- /dev/null
+++ b/zh-CN/src/tests/assertions.md
@@ -0,0 +1 @@
+# Assertions
diff --git a/zh-CN/src/tests/benchmark.md b/zh-CN/src/tests/benchmark.md
new file mode 100644
index 0000000..f883201
--- /dev/null
+++ b/zh-CN/src/tests/benchmark.md
@@ -0,0 +1,3 @@
+# Benchmark
+
+https://doc.rust-lang.org/unstable-book/library-features/test.html
\ No newline at end of file
diff --git a/zh-CN/src/tests/intro.md b/zh-CN/src/tests/intro.md
new file mode 100644
index 0000000..007eb95
--- /dev/null
+++ b/zh-CN/src/tests/intro.md
@@ -0,0 +1 @@
+# Tests
diff --git a/zh-CN/src/tests/unit-integration.md b/zh-CN/src/tests/unit-integration.md
new file mode 100644
index 0000000..68df7e4
--- /dev/null
+++ b/zh-CN/src/tests/unit-integration.md
@@ -0,0 +1 @@
+# Unit and Integration
diff --git a/zh-CN/src/tests/write-tests.md b/zh-CN/src/tests/write-tests.md
new file mode 100644
index 0000000..245c701
--- /dev/null
+++ b/zh-CN/src/tests/write-tests.md
@@ -0,0 +1 @@
+# Write Tests
diff --git a/zh-CN/src/threads/atomic.md b/zh-CN/src/threads/atomic.md
new file mode 100644
index 0000000..eecfaa8
--- /dev/null
+++ b/zh-CN/src/threads/atomic.md
@@ -0,0 +1 @@
+# Atomic
diff --git a/zh-CN/src/threads/basic-using.md b/zh-CN/src/threads/basic-using.md
new file mode 100644
index 0000000..f0a2d46
--- /dev/null
+++ b/zh-CN/src/threads/basic-using.md
@@ -0,0 +1 @@
+# Basic using
diff --git a/zh-CN/src/threads/intro.md b/zh-CN/src/threads/intro.md
new file mode 100644
index 0000000..f60f399
--- /dev/null
+++ b/zh-CN/src/threads/intro.md
@@ -0,0 +1 @@
+# Threads
diff --git a/zh-CN/src/threads/message-passing.md b/zh-CN/src/threads/message-passing.md
new file mode 100644
index 0000000..4d33941
--- /dev/null
+++ b/zh-CN/src/threads/message-passing.md
@@ -0,0 +1 @@
+# Message passing
diff --git a/zh-CN/src/threads/send-sync.md b/zh-CN/src/threads/send-sync.md
new file mode 100644
index 0000000..171f95f
--- /dev/null
+++ b/zh-CN/src/threads/send-sync.md
@@ -0,0 +1 @@
+# Send and Sync
diff --git a/zh-CN/src/threads/sync.md b/zh-CN/src/threads/sync.md
new file mode 100644
index 0000000..bc4491e
--- /dev/null
+++ b/zh-CN/src/threads/sync.md
@@ -0,0 +1 @@
+# Sync
diff --git a/zh-CN/src/type-conversion.md b/zh-CN/src/type-conversion.md
new file mode 100644
index 0000000..7b930e5
--- /dev/null
+++ b/zh-CN/src/type-conversion.md
@@ -0,0 +1 @@
+# Type Conversion
diff --git a/zh-CN/src/unsafe.md b/zh-CN/src/unsafe.md
new file mode 100644
index 0000000..df49df6
--- /dev/null
+++ b/zh-CN/src/unsafe.md
@@ -0,0 +1 @@
+# unsafe
diff --git a/zh-CN/src/variables.md b/zh-CN/src/variables.md
new file mode 100644
index 0000000..ee1fba4
--- /dev/null
+++ b/zh-CN/src/variables.md
@@ -0,0 +1 @@
+# Variables
diff --git a/zh-CN/src/weak.md b/zh-CN/src/weak.md
new file mode 100644
index 0000000..04b7a8f
--- /dev/null
+++ b/zh-CN/src/weak.md
@@ -0,0 +1 @@
+# Weak and Circle reference
diff --git a/zh-CN/src/why-exercise.md b/zh-CN/src/why-exercise.md
new file mode 100644
index 0000000..c3e5e3f
--- /dev/null
+++ b/zh-CN/src/why-exercise.md
@@ -0,0 +1 @@
+# Why Exercise.rs