Мерц резко сменил риторику во время встречи в Китае09:25
HS2 said in response: "Chief Executive Mark Wild has been clear that overall delivery of HS2 has been unacceptable and he's committed to ending the project's cycle of cost increases and delays."
因此，人们选择在制度之外经营，并不是道德堕落，而是制度排斥。他们在非正式网络中完成占地、交易与仲裁。这些规则未必高效，但至少可行。然而，这套体系无法标准化，无法跨区域使用，也无法被金融系统识别，一个在贫民窟有效的“地契”，在银行依然一文不值。。业内人士推荐旺商聊官方下载作为进阶阅读
Source: Computational Materials Science, Volume 267
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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.，更多细节参见91视频
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