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The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.，这一点在雷速体育中也有详细论述
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明代书法家张弼笔下的元宵诗轴，将“去年”与“今时”相类比，将“烂熳新诗”与“红梅零落”相对照，表达出今昔之感。张弼以疾如骤雨、矫若游龙的草书写就诗文，信手走笔间气韵连贯，洒脱遒劲中藏着深沉的人生感慨。
(define graph-file "dep-graph.dot")，更多细节参见搜狗输入法