流程度量利用事件层的事件计算度量。

Process metrics use the events in the event layer to compute the metric.

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购买者的虚拟机器文档在App引擎上面显示，然后再送到销售者的服务器上（这是一种虚拟的机器，是云计算度量的主要单元）。

The buyer's "virtual machine" files (a virtual machine is the main unit of measurement in cloud computing) are parked on App Engine before being sent to a seller's servers.

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