- At the first sight一眼看去;乍一看;
- at first thoughtadv.初一想;
- at first sight乍看之下，一看到…就;
- airman first class（美国）空军一等兵;
- first string第一弦;
- first sergeantn.<美>（美陆军陆战队）军士长;
- first runn.首轮放映;首映;
- first round前一单轮;
- first quartern.上弦;
- first price最初成本;
- first place[体]第一名;[计][WIN]冠军;
- first performance（戏剧、电影等）初演，初映，首场演出;
- first lieutenant（美国陆军、空军、海军陆战队的）中尉;
- first leg[体]第一赛程;
- first impression初步印象;
- first hand[体]第一家;
- first half上半时;
- first former第一个前
- 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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