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城市群是指以中心城市为核心向周围辐射构成的多个城市的集合体。城市群经济紧密联系,功能分工合作,交通联合一体,并通过城市规划、基础设施和社会设施建设共同构成具有鲜明地域特色的社会生活空间网络~1。城市(群)的集聚与扩散,主要是经济和人口等要素在空间分布上的动态演化及趋向~(2~4)。在城市群中,中心城市集聚外围中小城市的资源
An urban agglomeration refers to a collection of cities that radiate from the surrounding area with a central city as the core. The urban agglomerations are closely linked in economy, functional division of labor, and transportation are united. Through the urban planning, infrastructure and social facilities construction, they constitute a network of social life spaces with distinctive regional characteristics. The agglomeration and spread of cities (groups) are mainly the dynamic evolution and trend of the spatial distribution of economic and demographic factors (2-4). In urban agglomerations, central cities gather the resources of small and medium-sized cities in the periphery