// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
メモリ高騰でPCの原価のうち35％をメモリが占めるほどに，更多细节参见旺商聊官方下载
The first thing a multi-tasking operating system needs from hardware is isolation: multiple programs must share one processor without being able to read, write, or jump into each other's memory. The 80386 achieves this through memory protection -- two independent address translation layers.，更多细节参见safew官方下载
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