- airman first class（美国）空军一等兵;
- first thing一大早;
- first string第一弦;
- first sergeantn.<美>（美陆军陆战队）军士长;
- first round前一单轮;
- first prize[计] 一等奖，头等奖;
- first past the post<英>得票多者当选议员的选举制度;
- first offendern.初次犯罪者，初犯;
- first nightn.首夜演出;
- first namen.名;
- first mover倡议人，发起人;
- first meiotic division第一减数;
- first linen.首行;第一线;
- first leg[体]第一赛程;
- first impression初步印象;
- first half上半时;
- first grade头等的;
- first frost初霜;
- first fit第一适合法;
- first everadj.首次的；前所未有的；史无前例的;
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