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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.，更多细节参见一键获取谷歌浏览器下载
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The Los Angeles District Attorney's Office declined to comment when contacted by the BBC.，这一点在heLLoword翻译官方下载中也有详细论述