防守节点要防范它不能通讯的节点，并且不能接受来自那些节点的关机指令。
The defender assumes that it is defending against any cluster nodes that it cannot communicate with and for which it did not receive a shutdown notification.
其他没有得到Quoru m盘且不能与防守节点通讯的节点称为挑战节点。
All other nodes (nodes that do not own the quorum disk and cannot communicate with the node that owns the quorum resource) become challenging nodes.
即使一支球队有好的防守球员，但是一个人不能像承担一支球队的进攻任务一样承担起这个球队的防守。
While there are good defensive players, one person can’t carry a defense the same way a player can carry a team offensively.
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