Let's go back to that triangle; seen from above there's three equal nodes.
我们回到那个三角形：从上往下，你看能到三个平等的节点。
These B nodes are equal, but they are not the same node.
这两个 B节点是等同的，但它们不是相同的节点。
But two nodes that are equal are not necessarily the same.
但是两个相等的节点不一定是相同的。
But two nodes that are equal are not necessarily the same.
但是两个相等的节点不一定是相同的。
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