Kevin Church/ BBC News
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，更多细节参见搜狗输入法2026
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.
我的原则就是我小时候被怎么对待，我不爽，那我尽量不去做（除了原则性问题）。对于学习来说，我也已经处于半随缘状态。不过新的一年，我希望自己可以做到：
30多年前，在福建最贫困的闽东山区任职，习近平同志就明确强调：