三位曾對總統不利裁決的大法官坐在前排，表情毫無變化地觀看。
return (struct page_info *)(((unsigned long long)x) & ~(PAGESZ-1));
，推荐阅读im钱包官方下载获取更多信息
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
While internal divisions have long been the Victorian Liberal party’s main obstacle to winning government, a new threat is emerging on its right flank: One Nation.
# What is the lesson here?