1. a big headache令人头痛的事情

2. a fraction of -部分

3. a matter of concern焦点

4. aseriesof一系列,一连串above all首先尤其是

5. absent from不在缺席

6. abundant in富于

7. account for解释

8. accuse sb. of sth.控告

9. add to增加(add up to)

10. afterall 毕竟究竟

11. agree with同意

12. ahead of time /schedule提前

13. anead of在..之前(anhead of time提前)

14. alien to与..相反

15. all at once突然，同时

16. all but几乎除了...都

17. all of a sudden突然

18. all over again再一次，重新

19. all over遍及

20. all right令人满意的;可以

21. all the same仍然照样的

22. all the time一直始终

23. angry with sb. at/about sth.生气，愤怒

24. anxious about/for忧虑担心

25. anything but根本不

26. apart from除...外(有/无)

27. appeal to吸引，申诉，请求

28. applicable to适用于

29. apply to适用

30. appropriate for/to适当,合适

31. approximate to近似，接近

32. apt at聪明，善于

33. apt to易于

34. around the clock夜以继日

35. as a matter of fact实际上

36. as a result(of)因此由于

37.as a rule通常照例

38. as far as ...be concerned就...而言

39. as far as远至到.程度

40. as fllows如下

41. as for至于，关于

42. as good as和...几乎样

43. as if好像防腐

44. as regards关于,至于

45. as to至于关于

46. as usual像平常一样,照例

47. as well as除... 外(也),即..又

48. as well同样也，还

49. ashamed of羞愧,害臊

50. aside from除...外(还有)

51. ask for the moon异想天开

52. at a Ioss茫然,不知所措

53. at atime一次，每次

54. at all costs不惜一切代价

55. at all events不管怎样,无论如何

56. at all times随时，总是

57. at all丝毫(不)，一点也不

58. at any rate无论如何，至少

59. at best充其量，至多

60. at first sight乍一看,初看起来

61. at first最初,起先

62. at hand在手边,在附近

63. at heart内心里，本质上

64. at home在家,在国内

65. at intervals不时,每隔..

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