The shake gesture is the primary way users expect to initiate undo and redo, but you can also include the system-provided Undo and Redo buttons in a navigation bar, if appropriate.

摇晃是用户期望启动撤消和重做的首要方法，但如果可以的话，你也可以在导航栏中包含系统提供的撤消和重做按钮。

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If the American people are satisfied with the status quo, why redo our health-care system entirely and turn much of it over to the federal government, which has not demonstrated a great problem-solving ability?

FORBES: Krugman's Sick Numbers