[肥料] 硝酸磷肥

VOA慢速英语 2007 1128a

This is the VOA Special English Health Report. Scientists have discovered that stored blood loses a life-saving gas. This discovery may explain why a great number of people get sick after receiving stored blood. In recent years, experts have wondere

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VOA慢速英语2007年（十一）月

专业术语—口腔生理学术语P2(英文详解)

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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SSS 2009-04-06

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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Scientific American(四)月

VOA慢速英语 2007 1113b

SCIENCE IN THE NEWS - Discovery That Stored Blood Loses a Life-Saving Gas Could Solve Mystery By Lawan Davis, Soo Jee Han and Caty Weaver / Broadcast: Mon, 12 Nov 2007 16:00:00 UTC VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm S

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VOA慢速英语2007年（十一）月

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