deb http://ftp2.cn.debian.org/debian/ jessie main non-free contrib
deb http://ftp2.cn.debian.org/debian/ jessie-updates main non-free contrib
deb http://ftp2.cn.debian.org/debian/ jessie-backports main non-free contrib
deb http://ftp2.cn.debian.org/debian-security/ jessie/updates main non-free contrib
deb-src http://ftp2.cn.debian.org/debian/ jessie main non-free contrib
deb-src http://ftp2.cn.debian.org/debian/ jessie-updates main non-free contrib
deb-src http://ftp2.cn.debian.org/debian/ jessie-backports main non-free contrib
deb-src http://ftp2.cn.debian.org/debian-security/ jessie/updates main non-free contrib