点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
1. the quality of being unsteady and subject to changes
e.g. he kept a record of price fluctuations
Synonym: wavering
2. an instance of changethe rate or magnitude of change
Synonym: variation
3. a wave motion
e.g. the fluctuations of the sea
多通过句子记忆单词，而不是单独死记硬背。
