211 be on duty 值班,值日,在上班时 212 be in duty bound to 有义务
213.be eager for 想得到,盼望
214.by ear 凭记忆,不看乐谱
215.have an ear for 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 容易,不费力
219.at ease 自在,不拘束
220.put sb. at his / her ease 使某人感到无拘束
221.economize on 节省
222.have an effect on 对有影响
223.be in effect 有效
224.go into effect 生效。
225.in effect 实际上
226.give effect to 实行,使生效
227.to no effect不起作用,没有取得任何效果
228. of no effect 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
省时省力的居家清洁小妙招
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