在现代生活的快节奏下，越来越多的人感到有压力，尤其是大城市里的年轻人。
With the rapid pace of modern life, more and more people feel the stress on them, especially young people in big cities.
本论文在此基础上，着重对反映城市化（尤其是其中的郊区化）进程中日趋复杂的现代城市空间结构变化的人口密度模型进行归纳整理。
On the base of McDonald's previous work, this paper put an emphasis on the survey of modern urban density functions, which is becoming increasingly complicated under the influence of suburbanization.
城市交通拥挤问题已经成为现代社会尤其是城市社会面临的最大课题之一。
The urban traffic jam problem has already become one of the greatest problems that the modern society, especially urban society is facing.
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