介绍:
41. as well 也
42. as yet 迄今，到目前为止
43. aside from 除......之外
44. associate…with… 把……和......联系起来
45. association with 与……的交往/联合
46. at a disadvantage 处于不利地位
47. at a loss 不知所措
48. at a time 每次，一次
49. at all 丝毫，根本
50. at any moment 随时
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