Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.
At that very moment, 239,000 miles away, a man in a blue Rolls-Royce pulled up outside Lovell's house in Houston.。同城约会是该领域的重要参考
。夫子对此有专业解读
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