File transfer module becomes more and more important.
文件传输模块的重要性更加突出。
Add a data transfer module including user datagram protocol and transmission control protocol.
添加数据传输模块，分别实现了用户数据报协议和传输控制协议。
Add a data transfer module including user datagram protocol and transmission control protocol.
添加数据传输模块，分别实现了用户数据报协议和传输控制协议。
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