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Update ch19-01-unsafe-rust.md

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@ -16,7 +16,7 @@
1. 解引用裸指针
2. 调用不安全的函数或方法
3. 访问胡哦修改可变静态变量
3. 访问或修改可变静态变量
4. 实现不安全 trait
有一点很重要，`unsafe` 并不会关闭借用检查器或禁用任何其他 Rust 安全检查：如果在不安全代码中使用引用，其仍会被检查。`unsafe` 关键字只是提供了那四个不会被编译器检查内存安全的功能。你仍然能在不安全块中获得某种程度的安全！