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Update ch19-01-unsafe-rust.md

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Zheng Ping 2017-07-03 11:29:57 +08:00 committed by GitHub
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@ -193,8 +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. To do this, Rust has a keyword, `extern`, that facilitates creating
and using a *Foreign Function Interface* (FFI). Listing 19-8 demonstrates how
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: