202. distinguish between (=make or recognize differences) 辨别 203. distinguish…from 把…与…区别开
204. do away with(=get rid of; abolish; discard eliminate) 除去，废除，取消; do away with (=kill) 杀掉， 镇压 205. have…to do with 与…有关系
206. without doubt (=undoubtedly)无可置疑地
207. in doubt(=in a condition of uncertainty)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 (do) (=be required by one's 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 one's 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 (one's) 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