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。WPS官方版本下载对此有专业解读
Ecologist Phillip Parker sets up his ladder to show us inside.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
The grid lines on the visualization represent a tree structure underneath. Every region is a node. When a node splits, it creates four children. The root node covers the entire space. Leaf nodes (nodes with no children) hold the actual points.