四六级备考：阅读真题常见的短语(15)

　　211. be on duty值班，值日，在上班时

　　212. be in duty bound to(do)(=be required by ones 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 ones 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(ones)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