推开一扇半掩的木门，冬日暖阳斜斜地打在满院的梨木板上。
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。关于这个话题，同城约会提供了深入分析
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.
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