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.
Медведев переиграл канадца Феликса Оже-Альяссима в двух сетах со счетом 6:4, 6:2. Встреча продлилась один час и 23 минуты.
，这一点在heLLoword翻译官方下载中也有详细论述
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elif response.status_code in (429, 503):