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201 distinct from 与截然不同 202. distinguish between 辨别 203. distinguishfrom 把与区别开 204. do away with 除去,废除,取消; do away with 杀掉, 镇压 205. haveto do with 与有关系 206. without doubt 无可置疑地 207. in doubt对表示疑惑 208. be due to 是由于 209. come off duty 下班 210. go on duty 上班 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 | 
