- at the first opportunity一有机会;趁早;
- at first sight乍看之下，一看到…就;
- at first hand直接地，第一手地;
- at first glance一看就，初看，乍看起来;
- court of first instance一审法院（庭）;
- first world warn.第一次世界大战;
- first visit初诊;
- first step第一级;初步;
- first sergeantn.<美>（美陆军陆战队）军士长;
- first quartern.上弦;
- first price最初成本;
- first personn.第一人称;
- 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 maten.（海军）大副;
- first languagen.本国语;
- first instance第一审，初审;
- first impression初步印象;
- first hand[体]第一家;
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