a-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/f
