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# Show current rules。关于这个话题，safew官方版本下载提供了深入分析
，推荐阅读同城约会获取更多信息
Go to technology，这一点在快连下载安装中也有详细论述
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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.