A quick, 20-minute power nap can revitalize us just enough to carry on with the rest of the day, but any longer than that and our ability to tell the time goes out the window.

飞快地睡上20分钟充电午觉，能恰到好处地让我们恢复元气、精神饱满地度过一天剩下的时光，不过若是比这再多睡一会儿，我们就能明显感到窗外的时间流逝了。

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The ability of critical facilities to carry out their mission during an emergency depends on the availability of power.

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