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 富於
account for 解釋
accuse sb. of sth. 控告
add to 增加(add up to)
after all 畢竟，究竟
agree with 同意
ahead of time / schedule 提前
ahead of 在……之前(ahead of time提前)
all at once 突然，同時
all but 幾乎;除了……都
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……外(有/無)
appeal to 吸引，申訴，請求
applicable to 適用於
apply to 適用
appropriate for/to 適當，合適
