快速的debian镜像

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deb http://debian.cn99.com/debian stable main contrib non-free
deb http://debian.cn99.com/debian-non-US stable/non-US main contrib non-free
deb http://debian.cn99.com/debian-security stable/updates main contrib non-free

deb-src http://debian.cn99.com/debian stable main contrib non-free
deb-src http://debian.cn99.com/debian-non-US stable/non-US main contrib non-free

以上的 stable，根据需要可以设置成 testing 和 unstable