This intermediary interprets requests from the virtual system to the host, thereby adding a layer of virtualization between the virtual system and the host.
这个虚拟中介截断了虚拟机系统发往主机的请求，也就是在虚拟机系统与主机之间添加了一个虚拟化层。
The transport layer is also called the host-to-host layer.
传输层也称为主机到主机层。
When error correction is not required, UDP provides unreliable datagram service that enhances network throughout at the host-to-host transport layer.
如果没有要求更改错误，则UDP提供不可靠的数据服务，从而增加网络在传输层的吞吐量。
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