如果操作系统无法在缓存中找到所需的映射，它就必须花更多的时间完成转换。
If the operating system can't find the required mapping in the cache, it has to spend some more time completing the translation.
如果操作系统无法在缓存中找到所需的映射，它就必须花更多的时间完成转换。
If the operating system can't find the required mapping in the cache, it has to spend some more time completing the translation.
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