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).
int4 — 最大程度的压缩，文件大小减少约 4 倍。质量损失更明显（约 2~10%，具体取决于模型），但通常可以接受，尤其对于函数调用而言。。91视频对此有专业解读
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Greek omicron (ο, U+03BF) is as dangerous as Cyrillic o: pixel-identical in 40+ fonts. But Greek rho (ρ, U+03C1, which maps to p) is pixel-identical only in Phosphate and Copperplate, two geometric/all-caps fonts where the structural distinction between rho and Latin p collapses. This is font-specific risk, not script-wide risk.