For example, a multicast lease might be used to set up a video conference.

例如，多播租约期限可以被用来设置视频会话。

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So the type of multicast application has become a important factor. For example, the security question of multicast member's expanding should be thought in distance education;

因此，组播的应用类型已经成为了决定安全组播应用的一个重要因素，如在远程教育中应重点考虑组播组扩展后的安全问题；

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