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.
（二）移动、损毁国家边境的界碑、界桩以及其他边境标志、边境设施或者领土、领海基点标志设施的；
。51吃瓜对此有专业解读
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
One Saturday, a 16-year-old hauled a heavy, three-foot tube into the middle of a large field in Wisconsin.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04