- at first thoughtadv.初一想;
- at first hand直接地，第一手地;
- at first glance一看就，初看，乍看起来;
- division signsn.除号( division sign的名词复数 );
- first runn.首轮放映;首映;
- first past the post<英>得票多者当选议员的选举制度;
- first namen.名;
- first mover倡议人，发起人;
- first linen.首行;第一线;
- first lieutenant（美国陆军、空军、海军陆战队的）中尉;
- first languagen.本国语;
- First Ladyn.第一夫人，总统夫人;
- first grade头等的;
- first frost初霜;
- first former第一个前
- first floorn.第一层;
- first fit第一适合法;
- first draft草案初稿;
- first cousin once removed远堂兄妹，远表兄妹;
- first come first served先到者先接受服务原则;
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