# 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