[mass noun]anxiety; mental uneasiness
不安，烦恼
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she sensed her friend's perturbation .她感觉到她的朋友心绪不宁。
[count noun]a cause of such anxiety or uneasiness
不安（或烦恼）的缘由
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Frank's atheism was more than a perturbation to Michael .弗兰克的无神论使得迈克尔非常不安。
a deviation of a system, moving object, or process from its regular or normal state of path, caused by an outside influence
搅乱，紊乱，扰乱
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some minor perturbation in his house's cash flow .他家中资金流动的某种小混乱。
【物理】 微扰。
【天文】 摄动。
"late Middle English： from Latin