Therefore, WS-BPEL claims that only one request-response operation per process instance may be active at any given time for each port type, operation, correlation set, and partner link.

因此，WS-BPEL 要求，在任何给定时间，对于每个端口类型、操作、相关集和伙伴链接，每个流程实例只能有一个请求-响应操作。

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It may seem quite innocuous early in the process, if members of the team use different fonts, type size, colors, and styles.

成员使用不同的字体、颜色和样式，这在流程的早期看起来似乎是无伤大雅的。

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Therefore, Business process Choreographer mandates that within one process instance at most one receive or pick activity or event handler may be active with the same port type and operation.

因此，Business Process Choreographer有如下强制要求：在一个流程实例内，最多一个具有相同端口类型和操作的接收或选择活动或者事件处理程序处于活动状态。

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The team believe that not only do the growth factors play a key role in development of the central nervous system, but also that too much of them may disrupt the normal process by which a cell develops into the correct type and moves to the right area, and dies at the right time.

BBC: Possible autism test for newborns