有了多播，每个客户机能拾取单一数据流而节省带宽。

With multicast, a single stream can be picked up by each client, saving bandwidth.

youdao

多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。

Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.

youdao

多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。

Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.

youdao