他认为，中国 AI 公司的基础设施非常好，取得了很多创新，也在攻克各种技术难题，但它们取得这样的结果，靠的并不是「走捷径」。
The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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