单词：orgnaophosphate
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pH - a measure of how acid or alkali a solution is. As the pH gets lower, the solution is more acid. At a pH of 7 the solution is neither acid nor alkali. pH is the inverse of the logarithm of the con
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a
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By Cindy Saine Washington 18 January 2008 Google's philanthropic arm has announced $25 million in new grants and investment to help make the world a better place. The computer search engine is focusing on projects that include disease and disaster pr
VOA标准英语2008年（一月）
歌曲： With Every Bit Of Me 艺人： Kevin Borg 音乐星级： ★★★★ 所属专辑： 未知 发行年代： 2008 风格： Pop 介绍： Kevin Borg是岛国马尔他的新秀，全名Kevin James Borg，1986年出生，他在2008年参加了瑞典偶像的比赛，并且获得了冠军。他是此比赛有史以来的
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AA: I'm Avi Arditti with Rosanne Skirble, and this week on Wordmaster: counting words. RS: If you wanted to show people the 88,000 most common words in English, how would you do it? Jonathan Harris thought of a sentence -- or something that looks lik
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The Ecological Farming Association is a non-profit group whose focus is on small-scale sustainable agriculture. Its website Eco-Farm.org helps promote agricultural education and networking. Spokeswoman Marcy Coburn says there are three blogs on the w
VOA标准英语2010年(二月)
Broadcast on COAST TO COAST: September 2, 2004 AA: I'm Avi Arditti with Rosanne Skirble, and this week on Wordmaster: counting words. RS: If you wanted to show people the 88,000 most common words in English, how would you do it? Jonathan Harris thoug
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