This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
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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（一）非正常损失的购进货物，以及与之相关的加工修理修配服务和交通运输服务；，更多细节参见爱思助手下载最新版本
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