a big headache 令人头痛的事情

a fraction of 一部分

a matter of concern 焦点

a series of 一系列，一连串

above all 首先，尤其是

absent from 不在，缺席

abundant in 富于

account for 解释

accuse sb of sth 控告

add to/add up to 增加



after all 毕竟，究竟

agree with 同意

ahead of time/schedule 提前

ahead of 在……之前

alien to 与……相反

all at once 突然，同时

all but 几乎；除了

all of a sudden 突然

all over again 再一次，重新

all over 遍及



all right 令人满意的；可以

all the same 仍然，照样的

all the time 一直，始终

angry with sb at/about sth 生气，愤怒

anxious about/for 忧虑，担心

anything but 根本不

apart from 除了

appeal to 吸引，申诉，请求

applicable to 适用于

apply to 适用



appropriate for/to 合适

approximate to 近似，接近

apt at 善于

apt to 易于

around the clock 夜以继日

as a matter of fact 实际上

as a result(of) 因此，由于

as a rule 通常，照例

as far as ... be concerned 就...而言

as far as 远至，到...程度



as follows 如下

as for 至于，关于

as good as 和

as if 好像，防腐

as regards 关于，至于

as to 至于，关于

as usual 像平常一样，照例

as well as 除

as well 同样，也，还

ashamed of 羞愧，害臊



aside from 除

ask for the moon异想天开

at a loss 茫然，不知所措

at a time 一次，每次

at all costs 不惜一切代价

at all events 不管怎样，无论如何

at all times 随时，总是

at all 丝毫(不)，一点也不

at any rate 无论如何，至少

at best 充其量，至多



at first sight 乍一看，初看起来

at first 最初，起先

at hand 在手边，在附近

at heart 内心里，本质上

at home 在家，在国内

at intervals 不时，每隔

at large 大多数，未被捕获的

at last 终于

at least 至少

at length 最终，终于



at most 至多，不超过

at no time 从不，决不

at one time 曾经，一度；同时

at present 目前，现在

at someone s disposal 任某人支配

at the cost of 以……为代价

at the mercy of 任凭

at the moment 此刻，目前

at this rate 照此速度

at times 有时，间或

aware of 意识到