21世纪的城市发展、特别是中心城市的发展,由于它是一定区域中经济发达、功能完善、能够辐射和带动周边共同发展的社会组织、行政组织和经济组织的统一体,所以城市既是一个经济范畴,同时也是一个社会范畴和人文范畴,它包括行政区划、城市空间、经济系统、历史文化和社会制度等 Urban development in the 21st century, especially in the development of central cities, is an economic entity that is economically developed and fully functional in a given area and can radiate and bring about the common development of the surrounding social, administrative and economic organizations. Therefore, the city is an economy Category, but also a social category and humanities category, which includes administrative divisions, urban space, economic system, history, culture and social system