muhicast group的用法和樣例：
例句
- Abstract class defines a reference to a member of the multicast group.
抽象類定義了對多播組成員的引用。 - Then the server, by sending a single packet of data to that multicast group, would be sending to all the clients as the packets are replicated somewhere along the way.
然後伺服器將單個數據包發送到多播組裡，當信息包沿著路線被重複某地操作時，將發送到所有的客戶機上。
