website introduction：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.
website introduction：National Library of Medicine / National Institutes of Health. Offers many important databases (PubMed, GenBank, OMIM) and some tools.
website introduction：National Library of Medicine's medline and pre-medline database.
website introduction：timeanddate.comRegistered于1997年，于1998年5月24日正式上线。在上线的第 one 天， website 吸引了24位用户。timeanddate.com最初的Services项目包括日历， world 时钟等，这些都是在1995年10月正式启动的。timeanddate.com自从创Employment开始就取得了稳定的发展，现在已经成为了 world 上Time和日期Services website 中最为流行的 one 个。
website introduction：A veritable cornucopia of streetwise lingo, posted and defined by its readers.
website introduction：Social community for researchers, fostering collaboration and knowledge exchange among researchers worldwide.
website introduction：Translation, dictionary, conjugation, grammar for English, French, Spanish, German, Italian, Russian, Chinese, Arabic, Japanese, Hebrew, Polish, Dutch ...
website introduction：An information source for scientific, technical, and medical research. Subscription required for some sections.
website introduction：Clinical experts provide current medical information and news on health topics.
website introduction：United StatesCountries气象局（National Weather Service）是United States商务部Countries海洋和大气Management局属下的六个部门之 one ，成立于1870年，总部位于马里兰州银泉，主要负责为United States及其属地、邻近水域及海洋Area提供Weather、水文及气候预报和警报，藉以保护生命财产和Countries经济。
website introduction：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.
website introduction：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.
website introduction：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.
website introduction：Finite element analysis and mechanical event simulation software for virtual prototyping. This was formerly Algor.
website introduction：Official Site.
website introduction：Noaa:United StatesCountries海洋气象局隶属于United StatesBusiness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Weather的预警，提供海图和空图，Management对海洋和沿海Resources.的利用和保护，研究如何改善对Environment的了解和防护。
website introduction：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.
website introduction：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.
website introduction：Authoritative weekly newspaper focusing on international politics and business news and opinion..
website introduction：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.
website introduction：Describes the history, organization and activities of the Agency. [several languages]
website introduction：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.
website introduction：Scans of print journals, with 10 major math journals (requires subscription).
website introduction：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.
website introduction：Blockchain.info is a utility site for the e-currency Bitcoin. The site allows you to browse the bitcoin blockchain, view currency statistics and offers a free web based online wallet.