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deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted 
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deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted 
deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted 
deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted 
deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted 
deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted 
deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted

deb http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe 
deb http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe 
deb http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe 
deb http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe 
deb http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe 
deb http://ftp.sjtu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe 
deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe 
deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe 
deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe 
deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe 
deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe