他的情绪似乎在一天中起伏不定。

His mood seemed to fluctuate throughout the day.

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His mood seemed to fluctuate throughout the day.

fluctuate 是动词,由拉丁词根 fluctu-(波浪)和后缀 -ate(使...)组成,字面意思是"像波浪一样起伏"。这个词用来描述数值、情绪等不断上下波动的状态。

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