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。
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？
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。
The snapshot is saved on the host and is available for you to revert to later.
快照将保存在主机中，您可以在以后恢复到快照。
The snapshot is saved on the host and is available for you to revert to later.
快照将保存在主机中，您可以在以后恢复到快照。
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