- At the first sight一眼看去;乍一看;
- at the first opportunity一有机会;趁早;
- at the first起初;
- 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;
- at first glance一看就，初看，乍看起来;
- at first起初，当初;
- airman first class（美国）空军一等兵;
- after class下课后;课余;
- business class二等舱，商务客舱;
- customer first一切为用户服务;
- court of first instance一审法院（庭）;
- control class[计][OOP]控制类;
- computer classn.计算机课;
- class of station电台类别;
- class meetingn.级会，班会;
- class dayn.毕业纪念日;
- class consciousnessn.阶级意识;
- class actionn.共同起诉;
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