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 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 reason why this is not a two-way relationship is that Customer only maintains an instance of the current open order.
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