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