In editing systems it is usual to have an Undo command that makes the document revert to the state before the user's most recent changes.
在编辑系统中通常会有撤销命令来使文档回复到用户编辑之前的状态。
In editing systems it is usual to have an Undo command that makes the document revert to the state before the user's most recent changes.
在编辑系统中通常会有撤销命令来使文档回复到用户编辑之前的状态。
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