fluctuate /ˈflʌktjueit/ vi. 波动，涨落，起伏：fluctuate in the exchange rate 汇率波动［考句］With prices fluctuating so much, it is difficult for the school to plan a budget. 由于价格波动太大，学校很难作预算。


fluctuation n. 起伏，波动：［考句］These continual fluctuations in temperature make it impossible to decide what to wear.气温的连续起伏不定使大家难以决定穿什么衣服好。