超级点是对等网络中的一个节点，它不但作为一个组中点成员的目录服务器，同时也是一系列超级点所组成的网络中的普通节点。
Super-peer is a node in a peer-to-peer network that operates both as a server to a set of clients, and as an equal in network of super-peers.
IP组播技术实现了IP网络中点到多点的高效数据传输， 它能弥补单播通信和广播通信的不足。
IP multicast technique realizes efficient data transmission from one point to multiple points in IP network, and remedies the defects of unicast and broadcast communication.
方法：缺血组结扎冠状动脉左室支中点；
Methods: Ligatured semipart of left coronary artery (ischemic group).
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