44. do/make/perform an experiment　　　 carry out an experiment 作实验

43.an unusual experience　 一个不同寻常的经历　　　　　

He has no experience of life at all. 他全无生活经验。an experienced teacher 一个有经验教师

42. traveling expenses 旅费　　　 cut down one's expense　 减少…费用

at the expense of 以…为代价　 He finished the work at the expense of his health. (at the cost of)

41. expect sb to do sty / that　　 The city was more beautiful than we had expected

expect too much of sb 对…期待过多

40. Heat expands mental.　 热量使金属扩胀.　　　　 expand the production　 扩大生产

39. We can't exist without water.　 存在　　　 come into existence = come into being

38. I am exhausted. = I am tired out. = I am worn out.　

37. excuse sb from 免除…的责任, 对其要求　 He was excused from piano practice.

36. Please excuse my interrupting you.= Please excuse me for my interrupting you.

35. make an excursion to sp 到…短途旅行　　　　　　 an excursion train 旅游专列