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.
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FT Edit: Access on iOS and web
学校违反有关法律法规规定，明知发生严重的学生欺凌或者明知发生其他侵害未成年学生的犯罪，不按规定报告或者处置的，责令改正，对其直接负责的主管人员和其他直接责任人员，建议有关部门依法予以处分。