Generating SAT problems
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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system may not always be able to understand the context of the code
5年过渡期里，总书记多次走进山野田间，为乡村特色产业的发展壮大指明方向：