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纵观世界近１００年历史，可以发现城市出现了集团化发展的趋势。这同区域经济集团化一样，是现代化发展到一定阶段的必然产物。国际上一些发达国家和地区在经济发展过程中，以大城市为核心的城市群作为所在国家或地区的“经济心脏”，凭借其强大的集聚效应和辐射作用，在带动
Looking at the history of the world for nearly 100 years, we can find that cities have witnessed the trend of collectivization. This, like the collectivization of regional economies, is the inevitable outcome of the development of modernization to a certain stage. In the process of economic development in some developed countries and regions in the world, urban agglomerations with big cities as the “economic heart” of their country or region rely on their strong agglomeration effects and radiation effects to drive