1. a big headache 令人頭痛的事情

2. a fraction of 一部分

3. a matter of concern 焦點(diǎn)

4. a series of 一系列,一連串

5. absent from 不在,缺席

6. abundant in 富于

7. account for 解釋

8. accuse sb. of sth. 控告

9. add to 增加（add up to）

10. after all 畢竟,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 與...相反

15. all at once 突然,同時(shí)

16. all but 幾乎;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 令人滿意的;可以

21. all the same 仍然,照樣的

22. all the time 一直,始終

23. angry with sb. at/about sth.生氣,憤怒

24. anxious about/for憂慮,擔(dān)心

25. anything but 根本不

26. apart from 除...外(有/無(wú))

27. appeal to 吸引，申訴，請(qǐng)求

28. applicable to適用于

29. apply to適用

30. appropriate for/to適當(dāng),合適

31. approximate to近似,接近

32. apt at聰明,善于

33. apt to易于

34. around the clock夜以繼日

35. as a matter of fact 實(shí)際上

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 遠(yuǎn)至,到...程度

40. as follows 如下

41. as for 至于,關(guān)于

42. as good as 和...幾乎一樣

43. as if 好像,防腐

44. as regards 關(guān)于,至于

45. as to 至于,關(guān)于

46. as usual 像平常一樣,照例

47. as well as 除...外(也),即...又

48. as well 同樣,也,還

49. ashamed of 羞愧,害臊

50. aside from 除...外(還有)

51. ask for the moon異想天開(kāi)

52. at a loss 茫然,不知所措

53. at a time 一次,每次

54. at all costs 不惜一切代價(jià)

55. at all events 不管怎樣,無(wú)論如何

56. at all times 隨時(shí),總是

57. at all 絲毫(不),一點(diǎn)也不

58. at any rate 無(wú)論如何,至少

59. at best 充其量,至多

60. at first sight 乍一看,初看起來(lái)

61. at first 最初,起先

62. at hand 在手邊,在附近

63. at heart 內(nèi)心里,本質(zhì)上

64. at home 在家,在國(guó)內(nèi)

65. at intervals 不時(shí),每隔...

66. at large 大多數(shù),未被捕獲的

67. at last 終于

68. at least 至少

69. at length 最終,終于

70. at most 至多,不超過(guò)

71. at no time 從不,決不

72. at one time 曾經(jīng),一度;同時(shí)

73. at present 目前,現(xiàn)在

74. at someone's disposal 任...處理

75. at the cost of 以...為代價(jià)

76. at the mercy of 任憑...擺布

77. at the moment 此刻,目前

78. at this rate 照此速度

79. at times 有時(shí),間或

80. aware of 意識(shí)到

81. back and forth 來(lái)回地,反復(fù)地

82. back of 在...后面

83. back up 后備,支援

84. bare of 幾乎沒(méi)有,缺乏

85. be able to do 能夠

86. be around 差不多

87. be available to sb. 可用,可供

88. be bound to 一定

89. be capable of doing 能夠

90. be concerned with 關(guān)心…，涉足…

91. be dying to 渴望

92. be fed up with 受夠了be tired of

93. be in hospital 住院

94. be in season 上市的/in peak season旺季

95. be in the mood to do sth. 想做

96. be pressed for time時(shí)間不夠

97. be tied up with忙于

98. be under the weather 身體不好

99. beat around the bush 拐彎沒(méi)角

100. beat the crowd 避開(kāi)人群