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rise and fall;surge and subside;undulate;fluctuate;ups and downs关系～ ebb and flow of the relations; ups and downs in the relations/心潮～ one’s mind being in a tumult;one’s thoughts surged and subsided like the waves
fluctuation; fluctuating
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。