21. act on 奉行，按照……行动; act as 扮演; act for 代理

　　22. adapt oneself to(=adjust oneself to) 使自己适应于

　　23. adapt…(for) (=make sth. Suitable for a new need) 改编，改写(以适应新的需要)

　　24. in addition (=besides) 此外， 又， 加之

　　25. in addition to(=as well as, besides, other than)除……外

26. adhere to (=abide by, conform to, comply with, cling to, insist on, persist in, observe, opinion, belief ) 粘附；坚持，遵循

　　27. adjacent(=next to, close to) 毗邻的，临近的

　　28. adjust……(to) (=change slightly)调节；适应

　　29. admit of (=be capable of, leave room for) ……的可能，留有……的余地。

　　30. in advance (before in time) 预告，事先。

　　31. to advantage 有利的，使优点更加突出地。

　　32. have an advantage over 胜过。 have the advantage of 由于……处于有利条件 have the advantage of sb. 知道某人所不知道的事

　　33. take advantage of (=make the best of, utilize, make use of, profit from, harness)利用。

　　34. agree with 赞同(某人意见) agree to 同意

　　35. in agreement (with) 同意， 一致

　　36. ahead of 在……之前， 超过…… ahead of time 提前

　　37. in the air 1)不肯定， 不具体。 2)在谣传中。

　　38. above all (=especially, most important of all) 尤其是，最重要的。

　　39. in all (=counting everyone or everything, altogether) 总共，总计

　　40. after all 毕竟，到底；(not) at all 一点也不；all at once(=suddenly)突然；once and for all 只此一次；above all 最重要的；first of all 首先；all in all 大体上说；be all in 累极了；all but 几乎。

　　41. allow for (=take into consideration, take into account) 考虑到，估计到。

　　42. amount to (=to be equal to) 总计，等于。

　　43. answer for (undertake responsibility for, be liable for, take charge for) 对……负责。

　　44. answer to (=conform to) 适合，符合。

　　45. be anxious about 为……焦急不安；或anxious for

　　46. apologize to sb. for sth. 为……向……道歉

　　47. appeal to sb. for sth. 为某事向某人呼吁。appeal to sb. 对某人有吸引力

　　48. apply to sb. for sth. 为……向……申请；apply for申请；apply to 适用。

　　49. apply to 与……有关；适用

　　50. approve of (=consent to, be in favor of, favor, agree to, consider good,right) 赞成，approve vt. 批准