The problem is decomposed into three subproblems:1. The number of optimal empty car distribution;

将原问题分解为三个子问题：1．最优空车分配数；

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Empty car distribution is a big issue that attracts more and more attention in the railway industry.

空车调配是铁路运输企业极为关注的一个问题。

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Then, an empty-car service time-space network is created, and a multi-stage optimization model of empty car distribution un.

基于空车服务时空网络的构建，采用动态规划方法提出了铁路局（公司）管内空车调配的多阶段策略优化模型。

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The initiatives include plans to reform the car distribution system and efforts to regulate potentially toxic chemicals.

BBC: Schroeder warns of far-right backlash

Months after the Logan's launch, Renault learned of unofficial imports into France from Romania, prompted by press coverage of the car, so it rushed to organise distribution in western Europe, beginning with France.

ECONOMIST: Success on four wheels

Still, Nissan said this week it would build a big distribution hub near Bangkok to export locally-made car parts.

ECONOMIST: Thailand