Research on vehicle routing problem is of great importance in logistics distribution system.
研究车辆路径问题在物流配送系统中具有十分的重要意义。
But the solution of the vehicle routing problem in former research often focuses on unidirectional logistics distribution. And the research of bi-directional logistics is still immature.
从文献查阅来看，目前对车辆路径规划问题的研究大都集中于单向的物流配送，而对集货业务和配货业务同时存在的双向物流的研究还很不成熟。
But the solution of the vehicle routing problem in former research often focuses on unidirectional logistics distribution. And the research of bi-directional logistics is still immature.
从文献查阅来看，目前对车辆路径规划问题的研究大都集中于单向的物流配送，而对集货业务和配货业务同时存在的双向物流的研究还很不成熟。
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