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.

youdao

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.

youdao