The next layer, called the transport layer, is responsible for peer-to-peer communication (for example, within a host).
再上一层称为传输层，负责端到端的通信（例如，在一台主机内部）。
2
Peer-to-peer systems are often implemented as an abstract overlay network built at the application layer on top of the native or physical network.
对等系统常常实现为一个抽象的覆盖网络，构建于原生或物理网络之上的应用程序层上。
3
In the layered systems the service data sent to the given layer by the user is sent peer-to-peer to the users in the service layer without changing the lexeme.