Why did the speaker cite the example of graffiti in the london underground?

　　26. cling紧紧抓住 黏着 坚持 墨守

　　The newcomers moved into the poorest neighborhoods of the larger cities, they tended to stay together and cling to their old ways.

　　27. clumsy笨拙 粗陋的

　　I just made a jar for jam this morning, and now I can t find it anywhere. Do you know what happenen to him?

　　Did you hear crash? That was it. I m just as clumsy as ever.

　　28. cognitive认知的 认知能力的

　　Language is a test case for human cognitive development.

　　29. collapse倒坍 塌下

　　Why did the highway in northern Califorlia collapse?

　　30. collect 收集 接 收

　　To collect the data for my report, I need to talk someone who knows that small city very well. I was told that you lived there for quite a long time.

　　Oh, I wish I could help, but I was only a child then.

　　31. collision碰撞 冲突 抵触

　　25 years ago, Ray Anderson, a single parent with a one-year-old son witnessed a terrible accident which took place when the driver of a truck ran a ren light and collided with the car of Sandra. The impact of coolision killed Sandra instantly.

　　32. combination结合 联合 化合

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