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.
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2.2.3 Mermaid 类图（classDiagram）。搜狗输入法下载对此有专业解读
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08，更多细节参见Line官方版本下载