51. dioxide　 n. ［U] 二氧化物　 carbon -二氧化碳

50. dimension　 n.

　 1)［c/u］measurement of any sort (breadth;length;thickness;height,etc)

　　 (空间的)任何一种量度(宽度,长度,厚度,高度等)

eg. What are the -s of the room?这个房间的面积是多少?

2) (pl.) size, extent 大小, 体积, 程度, 范围

eg. a creature of huge -s　 形体庞大的动物

　　 I didn’t realized the -s　 of the　 problem.(fig)

我未曾意识到问题的严重程度.

3)aspect 方面，侧面　　 eg. There is a　 - to the problem that we have not discussed.

这个问题还有一方面我们没有讨论过.

49. departure　 n.［c/u]离开，离去；背离，违反

48. crayon. n.绘画用的铅笔，彩色粉笔，蜡笔。

47. corrupt. v. make sb/sth corrupt. 使(某人或物)堕落，腐化 败坏young people whose morals have been corrupted道德败坏的年轻人。

46. contemporary. adj.① -(with sb/sth)属于该时代或该时期的；属于同一时代的；②

　　当代的，现代的。

45. consensus.n.[c/u] -(on sth/that…) 意见一致；共同看法eg: ① The two parties have reached a consensus. ②There is broad consensus in the country on the issue.

44. component.n.(某事物的)组成部分、成分、零部件adj.作定语，(整体中的)一部分、组成的。

43. compensate v.-(sb)for sth. 补偿，赔偿；报偿；报酬。Nothing can compensate for the loss of one’s health.失去的健康是无法补偿的。

42. collision.[u/c]-(withsb/sth); -(between A and B) ①(物与物或人与人)相撞、碰撞、撞坏The two ships were in/came into collision两艘轮船相撞； ②抵触，(相反的目的、看法、意见等的)冲突.Her political activities brought her into collision with the law.她的政治活动触犯了法律。collision course 必然与某人(某事物)相冲突的进程或行动。