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
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