18. be accustomed to (=be in the habit of, be used to)习惯于。
19. be acquainted with(=to have knowledge of) 了解; (=to have met socially) 熟悉
20. act on 奉行，按照…行动; act as 扮演; act for 代理
21. adapt oneself to(=adjust oneself to) 使自己适应于
22. adapt…(for) (=make sth. Suitable for a new need) 改编， 改写(以适应新的需要)
23. in addition (=besides) 此外， 又， 加之
24. in addition to(=as well as, besides, other than)除…外
25. adhere to (=abide by, conform to, comply with, cling to, insist on, persist in, observe, opinion, belief ) 粘附; 坚持， 遵循
26. adjacent(=next to, close to) 毗邻的， 临近的
27. adjust..(to) (=change slightly)调节; 适应;
28. admit of (=be capable of, leave room for) …的可能，留有…的余地。
29. in advance (before in time) 预告， 事先
30. to advantage 有利的，使优点更加突出地
31. 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
32. take advantage of (=make the best of, utilize, make use of, profit from, harness)利用
33. agree with 赞同(某人意见) agree to 同意
34. in agreement (with) 同意， 一致
35. ahead of 在…之前， 超过…;……………. ahead of time 提前
36. in the air 1)不肯定， 不具体. 2)在谣传中
37. above all (=especially, most important of all) 尤其是，最重要的
38. in all (=counting everyone or everything, altogether) 总共， 总计
39. 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
40. allow for (=take into consideration, take into account) 考虑到， 估计到
41. amount to (=to be equal to) 总计， 等于。
42. answer for (undertake responsibility for, be liable for, take charge for) 对…负责。
43. answer to (=conform to) 适合，符合。
44. be anxious about 为…焦急不安; 或anxious for
45. apologize to sb. for sth. 为…向…道歉
46. appeal to sb. for sth. 为某事向某人呼吁. appeal to sb. 对某人有吸引力
47. apply to sb. for sth. 为…向…申请; apply for申请; apply to 适用。
48. apply to 与…有关;适用
49. approve of (=consent to, be in favor of, favor, agree to, consider good, right) 赞成， approve vt. 批准
50. arise from(=be caused by) 由…引起。
51. arrange for sb./sth. to do sth. 安排…做…
52. arrive on 到达; arrive at 到达某地(小地方);得出，作出; arrive in 到达某地(大地方);
53. be ashamed of (=feel shame, guilt or sorrow because of sth. done) 以…为羞耻
54. assure sb. of sth. (=try to cause to believe or trust in sth.) 向…保证， 使…确信。
55. attach(to) (=to fix, fasten; join) 缚， 系 ,结
56. make an attempt at doing sth. (to do sth.) 试图做…
57. attend to (=give one’s attention, care and thought)注意，照顾;attend on(upon)(=wait upon, serve, look after) 侍候，照料
58. attitude to/ toward …对…的态度。看法
59. attribute…to…(=to believe sth. to be the result of…)把.。归因于.., 认为.。是.。的结果
60. on the average (=on average, on an average) 平均
61. (be) aware of (=be conscious of , having knowledge or consciousness)意识到，知道。
62. at the back of (=behind) 在…后面
63. in the back of 在…后部(里面); on the back of 在…后部(外面); be on one’s back(=be ill in bed) 卧病不起。
64. at one’s back(=supporting or favoring sb.) 支持，维护; have sb. at one’s back 有…支持， 有…作后台
65. turn one’s back on sb. (=turn away from sb. in an impolite way) 不理睬(某人),背弃，抛弃
66. behind one’s back 背着某人(说坏话)
67. be based on / upon 基于
68. on the basis of 根据…, 在…基础上
69. beat…at 在…运动项目上打赢
70. begin with 以…开始. to begin with (=first of all) 首先， 第一(经常用于开始语)