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n.周期；时期( period的名词复数 )；（一段）时间；学时句号； 英英释义： period[ 'piriədz ]n.an amount of time"a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"同义词：time periodperiod of timeone of three periods of play in hockey gamesa st
