For multiple readers
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原子能科学研究与技术开发专项规划应当统筹基础理论、前沿领域、市场应用类研究项目，兼顾原子能行业相关发展需求，提高原子能产业的安全性、经济性和可持续性。。关于这个话题，服务器推荐提供了深入分析
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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