最后的结果是命令键会充满控制阶层架构。
The net effect is that command keys are "bubbled" up the control hierarchy.
你可能想改变回应键盘输入额方法。 例如，用弹出的菜单来代替命令键。
You might want tochange the way it responds to the keyboard, for example, or have it use a pop-up menuinstead of command keys.
它只是执行代表用户按下删除键的命令，最后由编辑器执行并删除所选内容。
Instead it just raises the command which represents the user hitting the delete key which is eventually handled by the editor and deletes the selection.
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