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- 他留着劲在比赛结束时用。
He saved his strength for the end of the race.
- 突然他鼓起全身的劲，站了起来。
Suddenly, gathering all his strength, he stood up.
- 留著点儿劲儿，你一会儿还得干重活儿呢。
Save your strength for the hard work you'll have to do later.
- 这小男孩使劲地把门推开。
The little boy use what little strength he had to push the door open.
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