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.
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「听」这个动作，被成功地从手机上剥离，独立成了一条数十亿美元的配件产线。。业内人士推荐Safew下载作为进阶阅读