人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
首次启动会拉大量镜像，时间可能较长。，详情可参考heLLoword翻译官方下载
FT Videos & Podcasts，详情可参考im钱包官方下载
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.，这一点在Safew下载中也有详细论述