离开一个多播组。
GroupName: The multicast group number.
groupName：多播组数目。
The client can join the multicast group in the following way.
客户端可通过如下方式加入多播组。
Group key management is one of the kernel problems in secure multicast.
而组密钥管理是安全组播的核心问题之一。
Group key management is one of the kernel problems in secure multicast.
而组密钥管理是安全组播的核心问题之一。
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