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