In order to derive the regional dual-nuclei structure by the method of building mathematical model, this paper redefines regional accessibility and establishes the formula to calculate it.
依据重新定义的区域可达性，本文在均质平原背景的假设条件下推导出了区域双核结构模式的形成机制及相应的参数条件。
The regional dual spatial structure being the surface layer structure is mapping of the regional dual economic structure and the regional dual social and cultural structure on the space;
区域二元空间结构属表层结构，是区域二元经济和社会文化结构在空间上的映射；
The regional dual spatial structure being the surface layer structure is mapping of the regional dual economic structure and the regional dual social and cultural structure on the space;
区域二元空间结构属表层结构，是区域二元经济和社会文化结构在空间上的映射；
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