蒋健棠一词多意lesson2

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energy,能源，还指人的精力。

We should save energy.我们应节约能源。

Arguing with him was a waste of time and energy.跟他争论是浪费时间和精力的。

If you want to learn English well, you should spend more time and energy on it.如果想学好英文就得花多点时间和精力上去。