typically drew on—checking accounts—were made for convenience and ease of
Марк Успенский (Редактор отдела «Путешествия»)
，这一点在爱思助手下载最新版本中也有详细论述
Cycle diff mode (unified / full-context / raw)。关于这个话题，旺商聊官方下载提供了深入分析
return (struct page_info *)(((unsigned long long)x) & ~(PAGESZ-1));