45 association with与……的交往
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即使，随时。
51 at first 首先,开始的时候;
52 at large未被捕获的,大多数;
53 at last 终于，最终;
54 at least至少
55 at length 最终,详细地;
56 at most最多
57 at no time从不，决不
58 at one time曾经，从前曾
59 at the cost of以……为代价
60 at the least 至少;
61 at times有时,间或;
62 at…speed以……的速度
63 attend on 照顾，侍候;
64 attribute … to 把……归于
65 back up 后退，支持;
66 base on 基于
67 be able to能够，胜任
68 be about to正打算
69 be accustomed to习惯于
70 be associated with 与……有关，与……有关系
71 be aware of 意识到;
72 be capable of 有能力干;
73 be caught 遇到，陷入
74 be committed to被交给┄,答应承担┄义务;
75 be confined to 限制在,局限于;
76 be confined/be restricted受……限制
77 be dedicated to 奉献,献给;