单词：thallium(i) perchlorate
过氯酸铊(I)
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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(62) / 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(77) / 评论(0)
VOA标准英语2008年（七月）
VOA标准英语2008年（七月）