"onyxId": "80479155036098560",
來到美國之後，關恆一直留了在紐約，送過外賣、開Uber、也開過卡車。剛開始的時候，他還未拿到給予尋求庇護者的工作許可證。
。关于这个话题，safew官方版本下载提供了深入分析
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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