单词学习：perturbation 名词
perturbation
/ˌpɜːrtərˈbeɪʃn/
n. 扰动，不安；摄动（天文学）；微扰（物理学）
The sudden change in the schedule caused a great deal of perturbation for 顾老师, who had meticulously planned the entire week.
日程的突然变动给精心规划了整个星期的顾老师带来了极大的不安。
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