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// 复制数组（避免原数组被修改影响其他测试）
。关于这个话题，im钱包官方下载提供了深入分析
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Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00619-4
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).