An optimization model was proposed to integrate operation decisions of distribution center by taking into account both the transportation and inventory cost of distribution centre and customers.
为实现配送中心运作决策一体化，构建多物品两级库存和运输决策优化模型。
Shunting operation is the center of marshalling yard organization, and is the important component of the whole railway transportation.
调车是编组站工作组织的中心环节，是铁路运输过程的重要组成部分。
The airport is a part of the whole civil aviation transportation system, it is the operation center of the civil aviation, and the most complicated subsystem of the whole system.
机场是航空运输系统的一个组成部分，是民航一切活动的中心，是民航系统结构最复杂的子系统。
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