// 作用：缓存当前位置右侧的"参考身高"，快速判断能看到的人
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.，更多细节参见同城约会
。safew官方下载是该领域的重要参考
A common mechanism of inhibition of the essential lipid II flippase MurJ by three distinct phage-encoded single-gene lysis proteins provides insights into potential new targets for antimicrobial development.，更多细节参见heLLoword翻译官方下载
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