12月9日，《儒藏》数字化项目启动仪式现场。受访者供图
KlefkiIntroduced in Gen VI (2013)
。业内人士推荐51吃瓜作为进阶阅读
提到美国养老，Sun City 是绕不开的标杆。
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.