更关键的是，它们通过“资本闭环”深度绑定下游订单：英伟达投资OpenAI并获得长期采购承诺，台积电则凭借先进制程的垄断优势，锁定了所有主流AI芯片客户。
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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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