When a window is maximized, the restore button replaces its maximize button.

当一个窗口已被最大化，还原按钮就会取代最大化按钮。

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You've already seen in the previous section how to add a Restore button.

通过上节的介绍，您已经了解了如何添加Restore按钮。

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If you want to rollback to the previous state of the system, simply click the Restore button, circled in Figure 6.

如果希望回滚到先前的系统状态，只需要单击Restore按钮，如图6中用圆圈圈住的内容所示。

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