考研单词|fluctuate的用法

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固定搭配：fluctuate between A and B，在A和B之间浮动。

The electricity consumption fluctuates between 30000 and 50000 units in winter and between 13000 and 20000 units in summer.
冬季用电量在30000——50000单位之间波动，夏季在13000~20000单位之间波动。