At one end, it is the synchronous model in which a system sends a message and waits for response.

一方面，系统发送消息并等待响应的情况下使用的是同步模型。

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The synchronous model is used because for consistency the worker process can't start processing a request that is not yet marked as "executing" in the ISAPI's internal requests table.

使用同步模块的原因是为了保持使ISAPI内部请求表中未标为“执行中”的请求不会被工作进程处理。

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The example messages in Figure 5 show synchronous messages; however, in sequence diagrams you can model asynchronous messages, too.

图 5 中的消息实例显示同步消息；然而，在序列图中，你也能为异步消息建模。

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The Signature Performance model is powered by a 416-horsepower AC synchronous electric motor producing 443 pound-feet of torque between zero and 5, 100 rpm, with a zero-to-60-mph acceleration of 4.4 seconds and a quarter-mile elapsed time of 12.6 seconds.

WSJ: 2012 Tesla Model S Signature Performance Review: I Am Silent, Hear Me Roar | Rumble Seat by Dan Neil