1. a big headache 令人头痛的事情 2. a fraction of 一部分3. a matter of concern 焦点 4. a series of 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. after all 毕竟,究竟 11. agree with 同意 12. ahead of time / schedule 提前 13. ahead of 在...之前（ahead 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 follows 如下 41. as for 至于,关于 42. as good as 和...几乎一样 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 loss 茫然,不知所措 53. at a time 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 ...
