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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.，推荐阅读WPS官方版本下载获取更多信息
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{ 51, 19, 59, 27, 49, 17, 57, 25 },。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读
China Deploys Thousands of Fishing Boats off Japan’s Coast, and They Are Not There to Fish