对于奥巴马来说不幸的是，他的行政命令作用有限。
Unfortunately for Mr Obama, his executive order will have limited effect.
当一个菜单命令作用于当前屏幕上的绝大部分项目时，当它不适用的时候将其禁用。
When a menu command applies to most of the screen elements currently displayed, disable it when it doesn't apply.
如果一个菜单命令只是作用于屏幕上的少数项目，那么当它不适用的时候将其移除。
If a menu command applies to only a few of the screen elements, remove it when it doesn't apply.
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