49. have an eye for　 对…有鉴赏力　　　　 keep an eye on　 照看　　　　

catch one's eye　　 吸引…注意　　　　 in the eyes of sb 在…心目中

have a good/poor eyesight　 视力

48. to the full extent of one's power 竭尽所能

to some extent/degree 到某种程度为止　　 To some extent, you are correct.

47. express way 快车道　　 express oneself　 表达　　 express my thanks 表达谢意

with a strange expression　 带着一种奇怪表情　　　　　

beyond expression无法表达　　 The scenery was beautiful beyond expression.　　

46. expose sty in it's true natural 揭露…本性　　　　 expose sty to 使…接触

Don't expose it to the sun. 不要让它接触阳光.　　　

Expose Children to some good books.

45. explore the unknown　 探索　　 explore the castle

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