网站简介：Google's free online language translation service instantly translates text and web pages. This translator supports: English, Arabic, Bulgarian, Chinese, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hindi, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish and Swedish.
网站简介：National Library of Medicine / National Institutes of Health. Offers many important databases (PubMed, GenBank, OMIM) and some tools.
网站简介：National Library of Medicine's medline and pre-medline database.
网站简介：timeanddate.com注册于1997年，于1998年5月24日正式上线。在上线的第一天，网站吸引了24位用户。timeanddate.com最初的服务项目包括日历，世界时钟等，这些都是在1995年10月正式启动的。timeanddate.com自从创业开始就取得了稳定的发展，现在已经成为了世界上时间和日期服务网站中最为流行的一个。
网站简介：Social community for researchers, fostering collaboration and knowledge exchange among researchers worldwide.
网站简介：A veritable cornucopia of streetwise lingo, posted and defined by its readers.
网站简介：An information source for scientific, technical, and medical research. Subscription required for some sections.
网站简介：Translation, dictionary, conjugation, grammar for English, French, Spanish, German, Italian, Russian, Chinese, Arabic, Japanese, Hebrew, Polish, Dutch ...
网站简介：美国国家气象局（National Weather Service）是美国商务部国家海洋和大气管理局属下的六个部门之一，成立于1870年，总部位于马里兰州银泉，主要负责为美国及其属地、邻近水域及海洋地区提供天气、水文及气候预报和警报，藉以保护生命财产和国家经济。
网站简介：Clinical experts provide current medical information and news on health topics.
网站简介：TED (Technology, Entertainment, Design) is an invitation-only event where the world's leading thinkers and doers gather to find inspiration. Initially an annual conference, the scope of TED has expanded to include a bi-annual global conference, a humanitarian prize, and free audio/video podcasts of extraordinary talks.
网站简介：Offers free language instruction where users translate documents and vote on the accuracy of those translations. Contains a description of how it works, a blog, and a study of the project's efficacy.
网站简介：With a look into the pages of the magazine, plus interactive features, maps, photography, news, exhibitions, things for kids, educational features, and hosting live events. Searchable web site.
网站简介：Finite element analysis and mechanical event simulation software for virtual prototyping. This was formerly Algor.
网站简介：Official Site.
网站简介：Noaa:美国国家海洋气象局隶属于美国商业部下属的科技部门，主要关注地球的大气和海洋变化，提供对灾害天气的预警，提供海图和空图，管理对海洋和沿海资源的利用和保护，研究如何改善对环境的了解和防护。
网站简介：Nature.com provides access to all Nature Publishing Group journals, online databases and services, including Nature News, and the social network for scientists Nature Network. Nature Publishing Group publishes products across the life, physical and applied sciences and clinical medicine. Nature.com hosts more than 70 journals, including Nature . The site also include Nature Jobs, which features access to job listings, editorial content about scientific careers and other information.
网站简介：HowStuffWorks.com is an award winning site covering thousands of topics within its own 10 channels: Auto, Computer, Electronics, Entertainment, Health, Home, Money, People, Science and Travel.
网站简介：Authoritative weekly newspaper focusing on international politics and business news and opinion..
网站简介：elsevier.com is the web resource for the publishing house Elsevier, specializing in scientific, technical and medical information. Find all products, support and contacts, and information about the company.
网站简介：The IEEE promotes the engineering process of creating, developing, integrating, sharing, and applying knowledge about electro- and information technologies and sciences for the benefit of humanity and the profession.
网站简介：Describes the history, organization and activities of the Agency. [several languages]
网站简介：Scans of print journals, with 10 major math journals (requires subscription).
网站简介：Developers of MATLAB, Simulink and Stateflow. The MathWorks offers a set of integrated products for data analysis, visualization, application development, simulation, model-based design, and code generation.
网站简介：Official site, with extensive information on America's National Parks and their management.