美国政府官方网站

美国政府官方网站2000年开通，起初使用firstgov.gov域名，2007年1月更名为usa.gov。网站中按照公众、企业和非赢利机构、政府工作人员、国外访问人员分类服务。首页即提供电子邮件、电话、博客等时尚联络方式的分类，

www.usa.gov - Jan 28, 2010 Details

AOL.com-美国在线

The new AOL.com brings the Web to you. Get access to email from AOL Mail, AIM Mail, Yahoo Mail and Gmail all in one place.

www.aol.com - Jan 28, 2010 Details

Reuters.com

Reuters.com brings you the latest news from around the world, covering breaking news in business, politics, entertainment, technology, and more in video and pictures.

www.reuters.com - Jan 28, 2010 Details

BBC

Breaking news, sport, TV, radio and a whole lot more. The BBC informs, educates and entertains - wherever you are, whatever your age.

www.bbc.co.uk - Jan 28, 2010 Details

联合国环境规划署

联合国环境规划署-UNEP

www.unep.org - Mar 04, 2010 Details

google

google.com - Apr 22, 2011 Details

中华人民共和国教育部政府门户网站

教育部政府门户网站由教育部办公厅主办，是教育部机关实施信息公开、新闻宣传、在线互动的线上窗口，提供标准版、手机版、客户端等访问形式。

www.moe.gov.cn - May 25, 2019 Details

ScienceDirect

www.sciencedirect.com - Oct 24, 2019 Details

JSTOR

JSTOR is a digital library of academic journals, books, and primary sources.

www.jstor.org - Oct 24, 2019 Details

Nature

First published in 1869, Nature is the world’s leading multidisciplinary science journal. Nature publishes the finest peer-reviewed research that drives ground-breaking discovery,

www.nature.com - Oct 24, 2019 Details