deb http://mirrors.ustc.edu.cn/debian stable main contrib non-free # deb-src http://mirrors.ustc.edu.cn/debian stable main contrib non-free deb http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free # deb-src http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib # deb-src http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib