Prior to applying a gravity model, one has to calibrate the impedance function.
应用重力模型的之前，你应该先校准阻抗函数。
The establishment of the impedance function is a key to the traffic distribution.
建立路阻函数是交通分配一个关键问题。
The establishment of the impedance function is a key to the traffic distribution.
建立路阻函数是交通分配一个关键问题。
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