fluctuate
词根词缀：
fluctuant adj. 变动的，波动的
fluctu 波浪 + ant …的 → 变动的，波动的
fluctuate v. 波动
fluctu 波浪 + ate 做，造成，使… → 波动
fluctuation n. 波动，起伏
fluctu 波浪 + ation 状态 → 波动，起伏
数据来源：新东方英语词汇速记大全
相关例句：
To be one flesh when prices fluctuate.
物价波动了，就融为一体。
Market interest rates fluctuate and may differ from the contract rate on a bond.
市场利率上下波动，可能不等于债券的约定利率。
Under the managed floating exchange rate regime, exchange rates always fluctuate acutely.
在管理浮动汇率制度下，汇率波动一直相当剧烈。
Volatile markets also mean prices can fluctuate widely during shipping and processing.
动荡的市场也意味着，在船运和加工过程中，价格可能大幅波动。
This is where opinions fluctuate and, in many cases, conflict with the actual rules.
这是波动的意见，在许多情况下，与实际的冲突规则。
A: It's normal for body weight to fluctuate widely throughout the day.
回答：体重在一天中有大的波动是正常的。