The gravity model explicitly relates flows between zones to interzonal impedance to travel.
重力模型明

过地区间
阻抗来将分布量和小区联系起来。
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) Moved by the noble cause of Project Hope and encouraged by what has been achieved so far, I would like to contribute my bit to the project by offering financial aid to a child in a remote area of your province.
希望工程这项高尚的事业感动了我, 同时这项项工程迄今所取得的成就也鼓舞了我。因此, 我想通过给贵省偏远地区的
个孩子提供经济帮助, 来为希望工程贡献我的微薄之力。
的中国》第
季
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