事件流、或者工作流程流，是业务用例的一个关键要素。
The flow of events, or workflow, is a key element of a business use case.
您可以将长时间运行的流程视为工作流流程；它可能会等待外部事件发生，或呼叫一个或多个人员执行任务。
You can think of a long-running process as a workflow process; it may wait for an external event to happen, or call upon one or more people to perform a task.
这对于在基于工作流程的环境中尝试数据驱动事件和其他业务处理非常有用。
This can be useful for tying data-driven events with other business processes in workflow-based environments.
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