fluctuate
/ˈflʌktjʊeɪt/verb
no obj.
- rise and fall irregularly in number or amount（数量）不规则波动, 起伏：
trade with other countries tends to fluctuate from year to year
与他国贸易额往往逐年波动
as adj. fluctuating a fluctuating level of demand.不断波动的需求。
派生词
fluctuation
noun词源
mid 17th cent.: from Latin fluctuat- 'undulated', from the verb fluctuare, from fluctus 'flow, current, wave', from fluere 'to flow'.