他们取消了货物定购单。

They cancelled their order for the goods.

《新英汉大辞典》

服务模型首先是识别处理定购单所涉及到的服务。

We start the service model by identifying the services that are involved in processing a purchase order.

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最后，我们来看处理定购单的服务规范，如图7所示。

Finally, there is the service specification for processing purchase orders (Figure 7).

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