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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.。关于这个话题，im钱包官方下载提供了深入分析
Jupyter saves notebooks as ipynb files which contain data and metadata in the same file. This makes them hard to read/inspect outside of Jupyter. Sabela currently saves the entire notebook as a markdown file (without the outputs). In future, we should save multiple files that can be bundled together in a zip file - the markdown, the file metadata, and extra files that are packaged with the notebook.，更多细节参见雷电模拟器官方版本下载
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