fluctuate

【发音】
美 /'flʌktʃʊ'et/ 英 /'flʌktʃʊeɪt; -tjʊ-/
【翻译】
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v.波动,使波动
英释:to change frequently in size, amount, quality, etc., especially from one extreme to another
【记忆】
flu(流动) + ctu + ate → 流动 → 波动, 涨落
【例句】
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Insect populations fluctuate wildly from year to year.
昆虫的数量每年变化很大。
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Prices were volatile, fluctuating between 20 and 40.
价格不稳定,在20至40美元之间波动。
【单词相关测试】
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With prices ______ so much, it is difficult for the school to plan a budget.
正确答案:B
解释:句意: 物价起伏这么大, 学校很难制订预算。vibrate: (使)振动; flutter: 拍翅; 飘动; swing: 摇摆。
A. vibratingB. fluctuatingC. flutteringD. swinging
【同、近义词】
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vi.波动;涨落;动摇
wave motion/shake/
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vt.使波动;使动摇
destabilize/
【同根词】
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adj
fluctuating : 波动的;变动的
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n
fluctuation : 起伏,波动
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v
fluctuating : 波动(fluctuate的ing形式)