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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.
，这一点在heLLoword翻译官方下载中也有详细论述
3600 systems. In general, other ATM manufacturers had pursued a path of
BBC中文訪問上述網站，現名為「漢奸展覽館」，首頁大字寫道「揭露偽裝，還原真相」，當中收錄超過100名中國異見人士，其中一人是網名為「李老師不是你老師」的李穎。
丹期也表示，他很清楚中期選舉的影響，也警惕剩下三年多任期時間有限：「沙漏正慢慢流逝，時間正在被浪費。」