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ex-, 向外。-pend, 花销，词源同pound,spend.

1. Don't expend all your time on such a useless job.

不要把时间消耗在这种无用的工作上.

2. Children expend a lot of energy and may need more high-energy food than adults.

孩子们消耗很多能量，可能比成年人需要更多高能量的食物。

3. If you give up exercise, your muscles shrink and fat increases. By the same token, if you expend more energy you will lose fat.

停止锻炼会使肌肉萎缩、脂肪增加。同样，如果花更多的精力锻炼，就会减掉脂肪。

4. I think it is safe to say that very few students expend the effort to do quality work in school.

我认为可以肯定地说学校里很少有学生肯为学好功课下功夫。

5. Don't expend all your energy on such a useless job.

不要把你的精力全花在这无益的工作上.