fluctuate /'flʌktʃʊeɪt/ v. (大小、数量、质量等)波动；(在…之间)起伏不定

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例句/词组:

My mood seems to fluctuate from day to day.

我的情绪似乎天天在变。

英语解释：

~ (between A and B) to change frequently in size, amount, quality, etc., especially from one extreme to another (大小、数量、质量等)波动；(在…之间)起伏不定