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）