socket层是网络子系统的标准API，它为各种网络协议提供了一个用户接口。
The sockets layer is the standard API to the networking subsystem and provides a user interface to a variety of networking protocols.
论文提出了一个三层网络子系统结构：内核级协议无关层、内核级协议相关层和用户级协议栈。
We carry out a three layers network subsystem structure that is protocol independent layer in kernel, protocol dependent layer in kernel and user level protocol stack.
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