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.
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。
In effect, toggling between Undo and Redo implements a comparison or what-if? Function; it just happens to be represented in the form of its implementation model.
在效果上，在撤销和恢复之间进行切换实现了比较或“如果这样将会怎样”的功能，它正好以实现模型的形式表达。
You cannot undo or redo a folder action while the folder is loading.
在装入文件夹期间无法复原或重做一个文件夹操作。
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