The key problem to D-S reasoning is basic probability assignment function, so the algorithm implementation of D-S reasoning is a esrious problem.
在基于D-S推理的信息融合中，其关键问题是基本概率赋值函数的构造。
Resistance function of urban road is the key and difficult problem in traffic study. It plays a vitally important role in traffic assignment.
城市道路的路阻函数是交通研究中的关键点和难点，对交通分配起着至关重要的作用。
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