be used to do ... 被用来作某事 be used to sth/doing sth 习惯做某事 be weak in/at在...弱 be worth doing 值得做... be wrong with 出毛病,不对头 beat…to death 把...打死 because of 因为;由于 before long 不久 beg one's pardon 企求 begin…with 从...开始 ...