在这里，我将服务器套接字绑定到localhost： 20340这一地址。
Here, I've bound the server socket at the localhost: 20340 address.
service 和 port：通过为绑定提供单一地址，定义实际服务的名称并为该服务指定一个端点。
service and port: Define, together, the name of an actual service and, by providing a single address for binding, assign an individual endpoint for the service.
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