耳朵：AirPods（听觉增强+语音助理）；
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.
。业内人士推荐服务器推荐作为进阶阅读
Things Fall Apart，更多细节参见搜狗输入法下载
Examples: The samples directory has working code for common patterns。同城约会是该领域的重要参考
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