a big headache 令人頭痛的事情
a fraction of 一部分
a matter of concern 焦點
a series of 一系列,一連串
above all 首先,尤其是
absent from 不在,缺席
abundant in 富于
account for 解釋
accuse sb of sth 控告
add to/add up to 增加
after all 畢竟,究竟
agree with 同意
ahead of time/schedule 提前
ahead of 在……之前
alien to 與……相反
all at once 突然,同時
all but 幾乎;除了
all of a sudden 突然
all over again 再一次,重新
all over 遍及
all right 令人滿意的;可以
all the same 仍然,照樣的
all the time 一直,始終
angry with sb at/about sth 生氣,憤怒
anxious about/for 憂慮,擔心
anything but 根本不
apart from 除了
appeal to 吸引,申訴,請求
applicable to 適用于
apply to 適用
appropriate for/to 合適
approximate to 近似,接近
apt at 善于
apt to 易于
around the clock 夜以繼日
as a matter of fact 實際上
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 遠至,到...程度
as follows 如下
as for 至于,關于
as good as 和
as if 好像,防腐
as regards 關于,至于
as to 至于,關于
as usual 像平常一樣,照例
as well as 除
as well 同樣,也,還
ashamed of 羞愧,害臊
aside from 除
ask for the moon異想天開
at a loss 茫然,不知所措
at a time 一次,每次
at all costs 不惜一切代價
at all events 不管怎樣,無論如何
at all times 隨時,總是
at all 絲毫(不),一點也不
at any rate 無論如何,至少
at best 充其量,至多
at first sight 乍一看,初看起來
at first 最初,起先
at hand 在手邊,在附近
at heart 內心里,本質上
at home 在家,在國內
at intervals 不時,每隔
at large 大多數(shù),未被捕獲的
at last 終于
at least 至少
at length 最終,終于
at most 至多,不超過
at no time 從不,決不
at one time 曾經(jīng),一度;同時
at present 目前,現(xiàn)在
at someone s disposal 任某人支配
at the cost of 以……為代價
at the mercy of 任憑
at the moment 此刻,目前
at this rate 照此速度
at times 有時,間或
aware of 意識到