虚拟广播通道是一种抽象，对跨越正常广播边界的通信提供了支持。
Virtual multicast channels are an abstraction that provide for communication across the normal boundaries of multicast traffic.
一个通道是对协议的一个抽象，供客户端与服务器通信时使用。
A channel is an abstraction for the protocol that is used for the client to communicate with the server.
一个通道是对协议的一个抽象，供客户端与服务器通信时使用。
A channel is an abstraction for the protocol that is used for the client to communicate with the server.
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