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。
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.
交通区位是区域的空间可达性的重要标志，强化了人口的沿河道分布并加大了区段间的差异。
Traffic location is an important symbol of spatial accessibility, and it strengthened the characteristics of along the watercourse and sectionality.
在宏观尺度上，区域综合运输成本是区域综合交通可达性和客货运规模的函数。
In macroscopic, regional comprehensive transportation cost is relative to regional integrated transportation accessibility and the scale of passenger and freight.
城市中心商业区是各种交通汇集的区域，具有较高的可达性，因此一直面临着各式各样的交通问题。
Central Retail District where types of traffic are assembled has more accessibility, therefore has been facing kinds of problems of traffic.
城市中心商业区是各种交通汇集的区域，具有较高的可达性，因此一直面临着各式各样的交通问题。
Central Retail District where types of traffic are assembled has more accessibility, therefore has been facing kinds of problems of traffic.
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