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1. Oxford American Dictionary

   perturbation

   • IPA[ˌpərdərˈbāSH(ə)n]

   美式

   • n.
     anxiety; mental uneasiness；a cause of anxiety or uneasiness

   • noun: perturbation, plural noun: perturbations

2. • 釋義

   n.

   名詞

   • 1. anxiety; mental uneasiness she sensed her friend's perturbation
   • ▪ a cause of anxiety or uneasiness Frank's atheism was more than a perturbation to Michael
   • 2. a deviation of a system, moving object, or process from its regular or normal state or path, caused by an outside influence some minor perturbation in his house's cash flow
   • ▪ a minor deviation in the course of a celestial body, caused by the gravitational attraction of a neighboring body.