Msnbot crawled from the disconnected node in upward and downward direction, creating a large subtree. This subtree caused the upward line between level 18 and 30 in figure 3.

• Msnbot从这个孤立节点开始向上和向下爬行,产生了一个棵大子树。这棵子树造成了图3中18层和30层之间向上的走势线。