紫苏是我国传统的药食同源植物，具有悠久的历史文化价值。在《诗经》《尔雅》等古代典籍中，紫苏被称为“荏”“桂荏”“荏苒”等，后来被收录于《名医别录》《本草纲目》等药学著作。
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.
。91视频对此有专业解读
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Supervised runtime behavior。同城约会对此有专业解读