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In contrast, prefecture-level cities and other node cities have rapid expansion speed. The urban space structure of the Beijing-Tianjin-Hebei urban agglomeration has changed from a "monocentric model" to a "polycentric model" to a "metropolitan model". High-tech industry parks around node cities have become important strongholds of urban space development, leading cities to evolve from monocentric structures to polycentric structures of downtown and industrial parks. The radiation range of core cities expands and spreads to surrounding
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