- at first thoughtadv.初一想;
- at first sight乍看之下，一看到…就;
- at first hand直接地，第一手地;
- class meetingn.级会，班会;
- first thing first事有先后；先事先为;
- first string第一弦;
- first step第一级;初步;
- First Secretaryn.（威尔士议会的）第一书记，执政党领袖;
- first runn.首轮放映;首映;
- first nightn.首夜演出;
- first namen.名;
- first lieutenant（美国陆军、空军、海军陆战队的）中尉;
- first leg[体]第一赛程;
- first instance第一审，初审;
- first impression初步印象;
- first gear一档;头挡;
- first everadj.首次的；前所未有的；史无前例的;
- first draft草案初稿;
- first cosmic velocity第一宇宙速度;
- first blood（尤指拳击比赛或决斗中的）最先见血;（比赛中）先得分，占先;
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