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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.。业内人士推荐51吃瓜作为进阶阅读
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2025年，勞動部查獲十家仲介公司違法向移工收取轉換工作的「買工費」。今年41歲的印尼移工Dido（化名）就是受害者之一。他來台近十年，換過四份工作，每次都被仲介要求支付3萬5000元至6萬5000元不等的費用。