The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
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，这一点在safew官方版本下载中也有详细论述
彼时，伴随德国大众汽车集团在上海建厂，克恩—里伯斯公司董事长斯坦姆希望投资中国市场，并对生产基地提出明确要求：靠近上海、交通物流便捷、文化底蕴深厚、劳动力素质较高。太仓，在这样的背景下进入了他的视野。
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.