10 additional monthly gift articles to share
南方周末科创力研究中心，搭建中国企业科创力数据库，通过对运营主体/控股股东在中国的A股、港股和美股企业（也包括少量未上市，但有发布经第三方审计年报的企业）的研发投入、研发产出和企业经营等近30个指标进行梳理，以追踪中国企业的科创活动。
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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.
size 2. The old backing store of size 1 is now garbage.
В России ответили на имитирующие высадку на Украине учения НАТО18:04