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。
Click Cancel to return to the Manage alert Settings page without deleting any alerts or alert results.
单击“取消”可返回“管理通知设置”页面，不会删除任何通知和通知结果。
Click Cancel to return to the Manage alert Settings page without deleting any alerts or alert results.
单击“取消”可返回“管理通知设置”页面，不会删除任何通知和通知结果。
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