- at the very startadv.一开始;
- at the start of在
- at the rate of以…速度;
- at the rate以这个速度
- at the beginning of在…之初;
- at one一致，合力;
- at heart内心里; 本质上;关心; 想到;
- at close quarters非常近;
- as a result结果， 因此;
- all at once突然;同时;
- a mixed bag一个混合的袋子
- a couple一对；一双;
- a buffer zone缓冲区
- be at a loss茫然不知;困惑不解;迷惘;半筹不展;
- be expert at做个专家
- bark atvt.狗朝着（对着）某人叫，对…狗吠;
- crack a smilev.展颜微笑;破颜一笑;
- charity begins at home（谚）好事从家里做起;
- give a lecture说课；讲授；主讲；讲演;
- get into a plane上飞机;
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