because I can simply do this:
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.
，详情可参考搜狗输入法下载
strict.writer.write(chunk3); // ok (queued in pending)
Richard MorrisTechnology reporter
Originally from Gattonside, outside Melrose, education took Murray in his teenage years towards London where he remained throughout most of his adult life.