as long as      phrase. 只要；和...一样长
                  as much as  差不多,尽...那么多
                  as usual 像往常一样, 照例
                  as well as  (除...之外)也,既...又 conj. 以及,又
                  at a loss   困惑, 不知所措
                  at all times   adv. 始终(经常,不论什么时候)
                  at any time 在任何时候
                  at least 至少
                  at one time adv. 有一时期(一次,曾经)
                  at the expense of adj. 以...作为代价(靠)