n slippage滑移；滑动；下降 slipping滑动 小 slipping滑动(slip的现在分词) 21.tiptoe (Line 2,Para 8) vi.walk quietly on one's toes踮着脚走 I)We tiptoed past the sleeping dog. II)She tiptoed up the stairs,so as not to wake up her sleeping parents. 词组短语 on tiptoe用脚尖地：急切地：悄悄地 同近义词 stand on tiptoe足尖站立 22.tray (Line 2,Para 5) n.(浅)盘，碟，托盘 I)She was carryinga tray ofdrinks. IID)He had his lunch on a tray in his bedroom. 知ifficult Sentences难句详解 1 "Welcome to Biology 101,"the professor began.(Line 1,Para 3) 译文：“欢迎你们来听生物101课，”教授开始上课。 In the United States,college courses are numbered.Usually courses numbered100 are for freshmen,.200 for sophomores(大二学生)，300for juniors,400 for seniors,500 for graduate level courses.So,Biology 101 is a beginning level biology course.Sometimes the last digit indicates the semester,i.e.101 is first semester,102 second semester,etc. 2 So now what?(Line 1,Para 4) 译文：怎么办？ The expression"Now what?"is used in spoken English when an attempt to do something has failed and one does not know what to do next. e.g.Kate tried each of the keys,but none of them fit."Now what?"she thought. 3 Forget it.(Line 3,Para 4) 译文：算了吧。 The expression“forget it”is used to: 1)tell sb.that sth.is not important or they do not need to worry about itn. slippage 滑移；滑动；下降 slipping 滑动 v. slipping 滑动（slip 的现在分词） 21. tiptoe (Line 2, Para 8) vi. walk quietly on one’s toes 踮着 脚走 I) We tiptoed past the sleeping dog. II) She tiptoed up the stairs, so as not to wake up her sleeping parents. 词组短语 on tiptoe 用脚尖地；急切地；悄悄地 同近义词 stand on tiptoe 足尖站立 22. tray (Line 2, Para 5) n. （浅）盘，碟，托盘 I) She was carrying a tray of drinks. III) He had his lunch on a tray in his bedroom. Difficult Sentences 难句详解 1 “Welcome to Biology 101,” the professor began. (Line 1, Para 3) 译文:“欢迎你们来听生物 101 课，”教授开始上课。 In the United States, college courses are numbered. Usually courses numbered 100 are for freshmen, 200 for sophomores (大二 学生), 300 for juniors, 400 for seniors, 500 for graduate level courses. So, Biology 101 is a beginning level biology course. Sometimes the last digit indicates the semester, i.e. 101 is first semester, 102 second semester, etc. 2 So now what? (Line 1, Para 4) 译文: 怎么办？ The expression “Now what?” is used in spoken English when an attempt to do something has failed and one does not know what to do next. e.g. Kate tried each of the keys, but none of them fit. “Now what?” she thought. 3 Forget it.(Line 3, Para 4) 译文:算了吧。 The expression “forget it” is used to: 1) tell sb. that sth. is not important or they do not need to worry about it