The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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（一）刻划、涂污或者以其他方式故意损坏国家保护的文物、名胜古迹的；
Britain has become the "most expensive place in the world" to build nuclear power plants, according to a government review of nuclear regulation.
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