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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比如「想喝水」、「想要吃xx」、「想要xx」来帮她完善表达。我们会给她演示一遍，然后让她重复一遍，说对了或做对了就表扬她，鼓励她；也告诉她，有什么需要就大胆说出来。