deb http://mirrors.163.com/debian/ stretch main contrib non-free
deb-src http://mirrors.163.com/debian/ stretch main contrib non-free

# deb http://security.debian.org/debian-security stretch/updates main contrib
# deb-src http://security.debian.org/debian-security stretch/updates main contrib

# deb http://mirrors.163.com/debian/ stretch-updates main contrib
# deb-src http://mirrors.163.com/debian/ stretch-updates main contrib