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).
掀开全平的后备箱盖板，你能看到一个 106L 的下沉储物舱，放一个 20 寸的登机箱还有得剩。更特别的是，它采用了可冲洗设计，带着泥水的户外装备、刚买回来的海鲜，或者孩子的沙滩玩具，都可以直接扔进去，用水一冲即净。
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