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or not that many objects can fit on a page.。关于这个话题，safew官方版本下载提供了深入分析
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.。关于这个话题，服务器推荐提供了深入分析
Hurdle: Everything you need to know to find the answers，这一点在heLLoword翻译官方下载中也有详细论述