端口号用于提供额外的通信通道，这样您才能够在两个主机之间实现多个连接。
The port number is used to provide additional communication channels so that you can support multiple connections between two hosts.
这样才能实现多媒体通信。
The functions of multimedia communication will be more various.
这样才能实现多媒体通信。
The functions of multimedia communication will be more various.
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