http://www.douzhe.com/docs/freebsd/handbook/ports-using.html
http://www.douzhe.com/docs/freebsd/handbook/cvsup.html#CVSUP-MIRRORS
cvsup.cn.FreeBSD.org
cvsup2.cn.FreeBSD.org
cvsup3.cn.FreeBSD.org
cvsup4.cn.FreeBSD.org
cvsup5.cn.FreeBSD.org
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