那帮歹徒的头儿老了，精力不济了，于是他手下一个年轻的家伙把他干掉了。

The leader of the gang was getting sort of tired and old, so one of the gangsters put him under.

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在一天工作结束时，有成就感的方法就是尽早解决难题，这样在精力不济时就可以放松了。

The way to feel fulfilled at the end of the day is to tackle the difficult tasks early so you can ease up when your energy wanes.

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“由于缺少睡眠，你可能更加情绪低落、精力不济，更加容易发火，”芝加哥大学睡眠专家伊夫·范考特教授说。

"Because of the lack of sleep, you may be more depressed, low energy, easier to get angry," University of Chicago sleep specialists said Professor Yifu Fan Lookout.

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“由于缺少睡眠，你可能更加情绪低落、精力不济，更加容易发火，”芝加哥大学睡眠专家伊夫·范考特教授说。

"Because of the lack of sleep, you may be more depressed, low energy, easier to get angry," University of Chicago sleep specialists said Professor Yifu Fan Lookout.

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