201．(be) distinct from ( = be different from) 与……截然不同
202．distinguish between (=make or recognize differences) 辨别
203．distinguish...from 把……与……区别开
204．do away with (=get rid of; abolish; discard eliminate ) 除去，废除，取消； do away with (=kill) 杀掉，镇压
205．have...to do with 与……有关系
206．without doubt (=undoubtedly) 无可置疑地
207．in doubt (=in a condition of uncertainty ) 对……表示疑惑
208．be due to 是由于
209．come off duty 下班
210．go on duty 上班
211．be on duty 值班，值日，在上班时
212．be in duty bound to (do) (=be required by one's job or esp. by conscience) 有义务（做）
213．be eager for 想得到，盼望
214．by ear (=play music from memory without having seen it printed) 凭记忆，不看乐谱
215．have an ear for (=have keen recognition of sounds esp. in music and language.) 对……有鉴赏力
216．a word in one's ear 私房话，秘密话
217．on earth究竟，到底，全然
218．with ease (=easily) 容易，不费力
219．at (one's) ease ( = without worry or nervousness) 自在，不拘束
220．put sb. at his / her ease (=free sb. from worry or nervousness) 使某人感到无拘束
221．economize on (=save sth. instead of being wasteful) 节省
222．have an effect on 对……有影响
223．be in effect (=be in operation) 有效
224．go into effect 生效。(近：come into effect; take effect; be brought into effect)
225．in effect (=in fact, really) 实际上
226．give effect to (=carry out) 实行，使……生效
227．to no effect不起作用，没有取得任何效果
228．(be) of no effect (=useless) 无效
229．to the effect that大意是……，主要内容是……
230．to that effect是那个意思的……
231．emerge from (＝appear, become known) 出现，暴露（问题，意见等）
232．place (or put, lay) an emphasis on 强调，把重点放在……上
233．encourage sb. in 鼓励；encourage sb. in his/her work 鼓励某人工作；encourage sb. in his/her idleness 怂恿某人游手好闲
234．encourage sb. in ...with sth. 用……鼓励某人做某事
235．on end (=continuously) 连续地
236．(be) at an end (=finished) 结束了
237．no end of (=very many/much) 很多，大量
238．in the end (=finally, eventually) 最终
239．at one's wit's end (=not knowing what to do or to say) 无法可想，智穷计尽
240．end up with 以……而结束
241．come to and end (＝finish) 结束
242．end in 以……为结束
243．engage in 或be engaged in 忙于，从事
244．enter for (＝put the name on a list for) 报名参加
245．enter into (＝begin) 开始（谈话，谈判等）
246．enter on / upon (=begin) 开始（一个时代，一种生涯，一段任期等）
247．be entitled to (=be given the right to do sth.) 有权……，有资格……
248．be equal to 等于
249．be/ feel equal to (=have enough strength, ability etc.) （某人）能胜任，能应付
on equal terms (=on and equal footing) 平等地
250．be equipped with 装备有，装有