他在这个项目上投入的时间和精力非常值得。

His time and energy on this project were well-spent.

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His time and energy on this project were well-spent.

well-spent 是由副词 well(好地)和动词 spend(花费)的过去分词 spent 组成的复合形容词,字面意思是"花费得很好的",引申为"用得值得的"或"投入得当的"。

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