A pottery head detached from a Roman vessel
人民警察的回避，由其所属的公安机关决定；公安机关负责人的回避，由上一级公安机关决定。，更多细节参见heLLoword翻译官方下载
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Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
Steven Vaughan-Nichols, Senior Contributing EditorSenior Contributing Editor，推荐阅读服务器推荐获取更多信息