而且具体的车辆路径优化问题，往往在时间和路程两方面都有限制和要求，而在这方面的研究相对较少。
Faced to concrete routing problem, time and routs are both restricted and required and researches in this field are not enough.
车辆路径问题和网络流问题都是非常著名的网络优化问题。
The VRP and the network flow problem are all famous network optimization problems.
城市交通网络中出行车辆从起点到终点的路径优化问题是智能交通研究的重要课题。
The route optimization for the vehicle going from the origin to the destination in traffic network is an important issue in intelligent traffic research.
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