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.

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如果配送资源不受限制，总配送成本不受顾客的库存成本的影响，问题转化为带有时间窗的车辆路径问题(VRPTW)。

If the resource is infinite in the distribution center, the distribution cost is not affected by the custom inventory, the problem is a vehicle routing problem with time window (VRPTW).

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