Create safety nets, such as the Undo and Revert to Saved commands, so that people will feel comfortable learning and using your product.

提供如撤销，恢复到已保存状态等操作，从而让用户放心的学习和使用您的产品。

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Have you ever saved a file, and then wanted to revert the changes you made?

你已经保存了一个文件的修改，而你又想撤销你的修改？

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For example, if you have saved changes twice already, you cannot revert to the first save.

例如，如果您将更改保存了两次，则无法恢复为第一次保存的状态。

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