記錄「新疆再教育營」的中國青年關恆在美被關押半年後獲釋:「失去自由之後,才更意識到它的重要性」

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The query point creates a new Voronoi region shown in blue, displacing some of the old regions. The weight of each natural neighbour is derived from the area of the displaced region .

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Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.