The reason why this is not a two-way relationship is that Customer only maintains an instance of the current open order.
这不是双向关系的原因在于，Customer仅维护当前打开订单的一个实例。
The open-order slab matching problem is how to assign these slabs to compatible orders in the hot-rolling plan.
无委托板坯匹配问题是研究如何将这些板坯合理分配给热轧计划中的合同。
The open-order slab matching problem is how to assign these slabs to compatible orders in the hot-rolling plan.
无委托板坯匹配问题是研究如何将这些板坯合理分配给热轧计划中的合同。
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