diff --git a/src/ch19-01-unsafe-rust.md b/src/ch19-01-unsafe-rust.md
index 38547b3..29af074 100644
--- a/src/ch19-01-unsafe-rust.md
+++ b/src/ch19-01-unsafe-rust.md
@@ -193,10 +193,7 @@ let slice = unsafe {
 
 #### 调用外部代码的`extern`函数是不安全的
 
-有时, 你的Rust代码需要与其它语言交互. Rust有一个`extern`关键字可以实现这个功能, 这有助于创建并使用*外部功能接口(Foreign Function Interface)* (FFI). 例19-8 demonstrates how
-to set up an integration with a function named `some_function` defined in an
-external library written in a language other than Rust. Functions declared
-within `extern` blocks are always unsafe to call from Rust code:
+有时, 你的Rust代码需要与其它语言交互. Rust有一个`extern`关键字可以实现这个功能, 这有助于创建并使用*外部功能接口(Foreign Function Interface)* (FFI). 例19-8演示了如何与定义在一个非Rust语言编写的外部库中的`some_function`进行交互. 在Rust中调用`extern`声明的代码块永远都是不安全的:
 
 <span class="filename">Filename: src/main.rs</span>
 
@@ -210,7 +207,7 @@ fn main() {
 }
 ```
 
-<span class="caption">Listing 19-8: Declaring and calling an `extern` function
+<span class="caption">例19-8: Declaring and calling an `extern` function
 defined in another language</span>
 
 Within the `extern "C"` block, we list the names and signatures of functions