firstadj.第一的;最初的adv.首先;第一n.最初;(序数词)第一
first deputy chief of staff第一副总参谋长
First known suicide attempt知首次企图自杀
first-year English majors英语专业新生
First -aid rescuer system救急救命士制度
first-in first-out rule先进先出规则
first half period of growth生育前半期
first-order approximation一次逼近理论
first mining faee under sea海域首采面
first episode schizophrenia首发精神分裂症