Network video broadcast with multicast can save bandwidth and reduce the load of server, but it often can't be realized because the equipments of interlinking networks don't support multicast.
用组播技术进行网上视频广播可以节约带宽和减轻服务器的负载，但往往由于网络互联设备不支持组播功能而不能实现。
The server can support a large scale of clients, save communication bandwidth and server processing resources, and make the clients get the newest data via broadcast.
通过广播，可以使服务器同时支持大量的客户机，节省通信带宽和服务器处理资源，保证客户机获得最新的数据。
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