deb http://mirrors.aliyun.com/debian/ stretch main contrib non-free
deb http://mirrors.aliyun.com/debian/ stretch-updates main contrib non-free
deb http://mirrors.aliyun.com/debian/ stretch-proposed-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian/ stretch main contrib non-free
deb-src http://mirrors.aliyun.com/debian/ stretch-proposed-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian/ stretch-backports main contrib non-free
deb http://mirrors.aliyun.com/debian-security/ stretch/updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian-security/ stretch/updates main non-free contrib
