Note: This example assumes that the user selects the node of interest using their left mouse button.

注意：本例假设用户使用鼠标的左键选择感兴趣的节点。

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The parent's parent is the node of interest next round and the four prerequisites are checked again from this new node to see whether the above operations need to be performed again.

在下一个循环中，父节点的父节点成了相关节点，再次从此新节点开始检查四个先决条件，查看是否需要再次执行上面的操作。

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The Publication Node enables the broker to transmit messages to subscribers that have an interest in this topic.

发布节点允许代理将消息传送到对该主题感兴趣的订户。

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