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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 | 
