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# 变量（Variables）
在 Rust，变量默认是不可变的.
不可变意味着当一个值被绑定到某个名字上，你就不能再对这个值做出更改。
当然，你可以通过在变量名前添加 mut 来使它们变得可变。
## 更多信息
- [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)
