id	domain	url
crln-8840	www.stats.gov.cn	www.stats.gov.cn/english/newsandcomingevents/t20120222_402786587.htm
crln-8840	thewebindex.org	http://thewebindex.org/2012/09/2012-web
crln-8840	nces.ed.gov	http://nces.ed.gov/pubsearch/pubsinfo.asp?pubid=2012046
crln-8840	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s009913331200016x