An example: reliable delivery of a synchronous request.

一个示例：一个同步请求的可靠传递。

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In Figure 3, the message flow makes a synchronous request.

在图3中，消息流发出了一个同步请求。

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Note that a synchronous request is processed on the calling class's thread.

请注意， 同步请求是在调用类的线程上处理的。

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