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修正翻译 #209

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修正翻译 #209

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3 changes: 1 addition & 2 deletions src/error.md
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`Option` 时，`unwrap` 可用于原型开发，也可以用于能够确定 `Option` 中一定有值
的情形。然而 `expect` 更有用，因为它允许你指定一条错误信息，以免万一还是出现
了错误。
* 当错误有可能发生，且应当由调用者处理时，使用 `Result`。你也可以 `unwrap` 然后
使用 `expect`，但是除了在测试或者原型开发中，请不要这样做。
* 当错误有可能发生，且应当由调用者处理时，使用 `Result`。你也可以使用 `unwrap` 或 `expect`，但是除了在测试或者原型开发中，请不要这样做。

有关错误处理的更多内容，可参考[官方文档][book]的错误处理的章节。

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