用户摇晃设备启动撤销，接着设备将显示警告，允许用户撤销他们刚刚输入的内容，重做之前撤销的内容，或取消撤销。

Users initiate an undo by shaking the device, which displays an alert that allows users to undo what they just typed, redo previously undone typing, or cancel the undo.

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你可以使用视图菜单中的撤销按钮取消任何已经完成的设置，或将设置恢复成初始状态。

You can use the Undo button in the view menu to discard any changes, and reset all changed Settings back to the previous states.

youdao

当我们遭遇飓风时，我们没有撤销空军，我们没有放弃海军，因此，我们也不会在这个时候取消国家宇航局。

We don't cancel the Navy. And we're not going to cancel NASA.

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