// 从个位到最高位，逐位排序
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.，详情可参考旺商聊官方下载
。业内人士推荐爱思助手下载最新版本作为进阶阅读
Elle Hunt is a freelance journalist
被分装售卖的山姆蛋糕。南方周末记者贾梦雅｜摄，详情可参考safew官方版本下载