单词：dysprosium perchlorate
过氯酸镝
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If we are looking for Martian bugs, we should search for life forms at least as tough and alien as this. Im looking at Mars in a point of view of a microbe. And as a microbe, I really need very, very tiny amount of water. I could probably live my ent
发表于:2019-02-03 / 阅读(72) / 评论(0)
自然百科2012年
自然百科2012年
As July 4th approaches, Americans look to the skies. Throughout the country, fireworks will be launched in celebration of the nation's independence. But what goes up must come down. Reporter Eric Libby looks at the environmental issues surrounding f
发表于:2019-02-04 / 阅读(91) / 评论(0)
VOA标准英语2008年（七月）
VOA标准英语2008年（七月）
Science and Technology 科技 Rare earths and climate change 稀土与气候变化 In a hole? 陷入了危机？ Demand for some rare-earth elements could rapidly outstrip supply 某些稀土元素可能很快会供不应求 MANY plans for reducing t
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经济学人综合
经济学人综合