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// 复制数组（避免原数组被修改影响其他测试），这一点在服务器推荐中也有详细论述
，更多细节参见同城约会
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，safew官方下载提供了深入分析
Matthew and Nicola Smith
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