- at the first opportunity一有机会;趁早;
- at first thoughtadv.初一想;
- at first sight乍看之下，一看到…就;
- at first glance一看就，初看，乍看起来;
- airman first class（美国）空军一等兵;
- court of first instance一审法院（庭）;
- every once in a whileadv.偶尔;
- for the first time初次，第一次;
- first visit初诊;
- first quartern.上弦;
- first place[体]第一名;[计][WIN]冠军;
- first half上半时;
- first grade头等的;
- first frost初霜;
- first floorn.第一层;
- first fit第一适合法;
- first draft草案初稿;
- first division team甲级队;
- first cosmic velocity第一宇宙速度;
- first batch首批;
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