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.
self.base_url = base_url，详情可参考safew官方版本下载
，推荐阅读91视频获取更多信息
Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
赋予执行权限并启动 Gateway：。服务器推荐是该领域的重要参考