| a bit of | 一点 |
| a good deal of | 大量的；很多的 |
| a great deal of | 大量 |
| a minute | 一会儿 |
| a moment ago | 刚才 |
| a piece/slice of the action | 插手，参与 |
| abide by | 遵守，遵照（法规、协议、判决等） |
| above all | 最重要的是；尤其是；首先 |
| absence from | 缺席；不在 |
| account for | 说明; 解释 |
| act as | 担当，充当 |
| act on/upon sth | 根据…行事 |
| after all | 毕竟；终究 |
| again and again | 再三地，反复地 |
| agree on | 对…取得一致意见 |
| agree to do sth | 赞成做某事 |
| agree with | 同意，和…意见一致 |
| ahead of | 在…之前 |
| aim at | v. 瞄准；目的在于 |
| aim at doing sth | 目的是做… |