这个用例代表长时间运行的流程，此流程对活动进行编排，以履行已下的订单。
This use case represents a long-running process that orchestrates the activities to fulfill an order that has been placed.
大多数下订单应用程序需要立即确认订单，但履行则是长时间运行的流程。
Most applications where an order is being placed, and that require immediate confirmation of the order, yet fulfillment is a long-running process.
例如，短时间运行的流程“下订单”可能会生成事件“新订单送达”(New Order Arrived)。
For example, the short-running process Place Order may generate the event New Order Arrived.
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