Ø do away with (=get rid of; abolish; discard eliminate) 除去,废除,取消;
　　 The long-range goal must be to do away with nuclear weapons altogether.
　　 Ø do away with (=kill) 杀掉, 镇压
　　 ...a woman whose husband had made several attempts to do away with her.
　　 Ø have…to do with 与…有关系
　　 That’s none of your business, it has nothing to do with you.
　　 Ø without doubt (=beyond dispute)无可置疑地
　　 Without doubt this has become the most important relationship I’ve developed while at college.
　　 Ø in doubt悬而未定
　　 An outcome is still in doubt.
　　 Ø due to 是由于
　　 Her illness was due to bad food.
　　 她的病是坏了的食物造成的。
　　 Ø come off 离开, 举行, 实现, 成为
　　 The trip came off on schedule.
　　 旅行按计划得到实现
　　 Ø be on duty 值班, 值日, 在上班时
　　 There were 2,250 policemen on duty in and around the stadium.
　　 Ø be in duty bound to (do) 有义务(做)
　　 As regards the criminals who plot to hijack aircraft or to sabotage the safety of civil aviation, any person is in duty bound to expose and inform against them by reporting the case to the people’s government.
　　 Ø be eager for 想得到, 盼望
　　 The boy was eager for success.
　　 男孩子急于获得成功。
　　 Ø by ear 凭记忆,不看乐谱
　　 He had no time to prepare for the party, so he had to play by ear. 他没有时间为这次聚会做准备，只好凭记忆演奏了。
　　 Ø have an ear for 对……听觉灵敏
　　 If you have an ear for music or language, you are able to hear its sounds accurately and to interpret them or reproduce them well.
　　 Moby certainly has a fine ear for a tune.
　　 Ø on earth 究竟, 到底, 全然
　　 Where on earth can he be? 他到底在哪儿呢?
　　 Ø with ease ( = easily) 容易, 不费力
　　 He passed the examination with ease.
　　 她轻松地通过了考试。
　　 Ø at (one’s) ease ( = without worry or nervousness) 自在,不拘束
　　 I felt at（my）ease.
　　 He’s at ease speaking pidgin with the factory workers and guys on the docks.
　　 Ø economize on 节省（也可以不要on作vt.）
　　 Hollywood has been talking about economizing on movie budgets.
　　 Ø have an effect on 对…有影响
　　 Alcoholic drink can have a bad effect on your body.
　　 含酒精的饮料会对你身体有很坏的影响。
　　 Ø be in effect (=be in operation) 有效
　　 The old system is still in effect旧制度仍有效。
　　 Ø take effect 生效 ( come into effect; go into effect; be brought into effect)
　　 The contract takes effect as of October 1.
　　 本合同从十月一日起生效。
　　 Ø give effect to (=carry out) 实行,使…生效
　　 It did not seek to give effect to the parties’ bargain, still less to make for them some bargain which they had not themselves made.