vagary
vagary[ˈveɪg(ə)ri](pl. -ies)- (一般作vagaries)an unexpected and inexplicable change in a situation or in someone's behaviour
难以预料的变化
the vagaries of the weather.
天气的变幻无常。
语源- late 16th cent. (also as a verb in the sense 'roam'): from Latin vagari 'wander'
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