deb http://mirrors.cloud.tencent.com/debian stretch main contrib non-free
deb http://mirrors.cloud.tencent.com/debian stretch-updates main contrib non-free
deb http://mirrors.cloud.tencent.com/debian-security stretch/updates main
#deb http://mirrors.cloud.tencent.com/debian stretch-backports main contrib non-free
#deb http://mirrors.cloud.tencent.com/debian stretch-proposed-updates main contrib non-free

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