#Stable:
deb http://security.debian.org/ stable/updates main contrib non-free
deb http://debian6.ustc.edu.cn/debian stable main non-free contrib
deb http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
deb-src http://debian6.ustc.edu.cn/debian stable main non-free contrib
deb-src http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
#Testing:
deb http://security.debian.org/ testing/updates main contrib non-free
deb http://debian6.ustc.edu.cn/debian testing main non-free contrib
deb http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
deb-src http://debian6.ustc.edu.cn/debian testing main non-free contrib
deb-src http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
#Unstable:
deb http://security.debian.org/ testing/updates main contrib non-free
deb http://debian6.ustc.edu.cn/debian unstable main non-free contrib
deb http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
deb-src http://debian6.ustc.edu.cn/debian unstable main non-free contrib
deb-src http://debian6.ustc.edu.cn/debian proposed-updates main contrib non-free
http://hi.baidu.com/%B5%FB%CF%FE%C3%CE/blog/item/50b0c0ec2a935fde2e2e2127.html
