除了段描述符的号码以外，这些寄存器的内容对所有软件来说都是不可访问的。
Other than segment descriptor numbers, the contents of these registers are inaccessible to all software.
在保护模式下，哪个寄存器引用栈段描述符。
In protected mode, which register references the descriptor for the stack segment?
更新段寄存器时，与其相应的段描述符必须在核心内存中修改，然后重新载入段寄存器。
In order to update a segment register, the corresponding segment descriptor must be modified in kernel memory and then reloaded into the segment register.
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