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Update ch02-00-guessing-game-tutorial.md

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@ -169,7 +169,7 @@ io::stdin().read_line(&mut guess)
.expect("Failed to read line");
```
当使用`.foo()`语法调用方法时，明智的选择是换行并留出空白（缩进）来把长的代码行拆开。我们可以把代码写成这样：
当使用`.expect()`语法调用方法时，明智的选择是换行并留出空白（缩进）来把长的代码行拆开。我们可以把代码写成这样：
```rust,ignore
io::stdin().read_line(&mut guess).expect("Failed to read line");