a series of 一系列,一连串
above all 首先,尤其是
after all 毕竟,究竟
ahead of 在...之前
ahead of time 提前
all at once 突然,同时
all but 几乎;除了...都
all of a sudden 突然
all over 遍及
all over again 再一次,重新
all the time 一直,始终
all the same 仍然,照样的
as regards 关于,至于
anything but 根本不
as a matter of fact 实际上