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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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Александра Статных (Редактор отдела «Путешествия»)
图⑥：新疆阿克苏地区阿瓦提县塔木托格拉克镇吐格贝希村的果园里，果农正忙着分拣、包装“冰糖心”苹果。
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