first aid急救firstadj.第一的；最初的adv.首先；第一n.最初；(序数词)第一First Cavalry Division Association第一骑兵师协会FIRST - ORDER PREDICATE CALCULUS一阶谓词演算FIRST TO BE WELL-KNOWN PRINCIPLE驰名在先原则First diskette bad or incompatible第一张磁盘损坏或不兼容First order optimization algorithm一阶优化算法first-order predicate expression一阶谓词公式First Ferry Outlying Islands Piers新渡轮各离岛线码头First Order Differential Equations一阶微分方程First Regiment in Liberating Jinan济南第一团First class or economic class?