// And the reader is no longer available when we return
（作者单位：中国社会科学院考古研究所）
。业内人士推荐一键获取谷歌浏览器下载作为进阶阅读
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.
Neil Murray moved back to the Scottish Borders during the pandemic.