在中国，用移动设备支付账单、定购服务、观看视频、寻找数据的人，比全世界任何地方都要多。

Already in China, more people use their mobile devices to pay their bills, order services, watch videos and find dates than anywhere else in the world.

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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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