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).
Credit: Tina Rowden / HBO
。新收录的资料对此有专业解读
但我们依然可以明显看到有黑色断裂，高频图谱看起来非常的毛刺；这也是为什么 AAC 的编码会比 mp3 的音质听起来要好的原因。
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