“用发展的办法消除贫困根源”“一把钥匙开一把锁”
五奶奶说，那时候闻讯赶来的亲戚，少说都有20个，大伙折腾了一上午把幸存的骡子弄上来。亲戚们还把自家骡子牵过来，一共八头骡子把一地麦秆驼回了五奶奶家。打那之后，她再没种那块地。她怕再闯祸，也不好意思再麻烦人。
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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.