21, at any rate , 无论如何,至少
22, at best , 充其量,至多
23, at first , 最初,起先
24, at first sight , 乍一看,初看起来
25, at hand , 在手边,在附近
26, at home , 在家,在国内
27, at intervals , 不时,每隔...
28, at least , 至少
29, at last , 终于
30, at length , 最终,终于
31, at most , 至多,不超过
32, at no time , 从不,决不
33, at present , 目前,现在
34, at the cost of , 以...为代价
35, all means , 尽一切办法,务必
36, account for, 说明(原因等)
37, allow for, 考虑到
38, arrive at, 达成，得出
39, ask for, 请求，要求
40, aim at, 瞄准，针对