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中文摘要：
交通技术进步与集聚经济在大城市中发生了良性互动,区际交通的改善也有利于大城市,使大城市继续增长。同时,大城市更倾向于对污染物治理付出更多的努力。大城市也不断地进行产业和空间调整,产业向高级服务业并向市中区集中。市中区成为城市地区的轮轴,周围的地方如同车轮,市中区与其周围通过像辐条一样的联系相互拉紧,城市发展在地域上呈同心扩展。在当今,同心扩展要强于走廊发展。从较大尺度上看,大范围走廊上的大城市,发展的趋势会更好些。大都市区中放射出的一些交通干线发展成经济走廊的可能性会增强。美国和德国的一些城市发展被用作这些论点的例证。这些结论为以都市区为对象的研究和应用提出了新的内容。
英文摘要：
There has been a positive interaction between traffic technical progress and agglomeration economies in the big cities, and inter-urban traffic improvement is also conducive to large cities, so that the cities continue growing. At the same time, large cities also tend to pay more pollutants governance efforts. Large cities also continue to adjust their industry to advanced services in structures and to the urban central in space. Central city and the around places respective as area hub and wheels are tight each other by spoke signifying their interdependency. Urban development displays concentric expansion in geography. The possibility that metropolitan areas in the shine of some of the traffic trunk develop into economic corridors will be enhanced. At present, concentric expansion is more significant than the corridor development. The development potential of the cities on large - scale corridor will be better than others. Some urban development in the United States and Germany is used as an example of these arguments. The new perspective and content for the study of metropolitan areas is proposed because of these findings.
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