城市是一个国家或地区经济发达、工业集中、科技文化比较先进的地方。在我国当前,随着经济体制的改革和现代科技的发展,一方面大、中城市在国民经济中的作用和地位越来越显 Cities are places where a country or a region has a developed economy, concentrated industries and advanced science, technology and culture. At present in our country, with the reform of the economic system and the development of modern science and technology, on the one hand, the role and status of large and medium-sized cities in the national economy have become increasingly evident