Of course if that all that fails, you could always, knock and wait for a reply.
当然如果这些都没用，你就可以敲敲西瓜，等它回应。
In the first use case, an application will connect, issue a request, and wait for a reply.
在第一个用例中，一个应用程序将建立连接、发起请求并等待回复。
A person initiated the service and must wait for a reply, and will eventually give up waiting.
某人发起这个服务且必须等待一个答复，并且最终将放弃等待。
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