1. During the crisis, oil prices fluctuated between $20 and $40 a barrel. 在危机时期，每桶石油价格在20元至40元之间波动。
2. The numbers of deer have fluctuated markedly since the entry of Europeans into Puget Sound country. 自从欧洲人进入普吉特海湾地区以来，鹿的数量波动很大。
3. Findings from the upper sections of the cores have confirmed what scientists already knew—climate during the last ice age fluctuated rapidly. 来自岩心上部的发现证实了科学家们已经知道的情况：最后一个冰河时代的气候变化非常快。
4. He fluctuated between hopes and fears. 他在希望和恐惧中徘徊。
5. He fluctuated between hope and despair. 他时而充满希望时而失望。
