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.
春节，大概是一年中「含片量」最高的时刻。
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我在北京同仁医院的病床上度过了一段难挨的时光。那时，经过三期的化疗，身上的淋巴瘤已然全部消失，但药物的副作用也明显地显现出来：厌食、失去味觉、便秘、失眠。何况，后面还有四期、五期、六期、七期，最终可能要八期的化疗等着我。可想而知，我的心绪是何等沮丧。“掐着指头数日子”“天花板像一页读腻了的书”，这是臧克家先生住院时写下的诗句，如今的我，每天都不得不默诵几遍。
Sentence Length: It also indicates the length of your sentences.