单词：inorganic materials which exist in the earth
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There are aliens out there, somewhere. I strongly believe this. Not sure what they look like, though. I really doubt they are green, like they are in science fiction movies. I also dont think they look like us. But Im sure they exist. I just dont thi
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The whole world is fascinated by UFOs. Do they exist or dont they? I bet you know someone who says they have seen a UFO. Probably someone a little crazy. If you think about it, UFOs are real. There are many things flying around in space and scientist
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Acid Rain 酸雨 Damage from acid rain is widespread - not just in eastern North America, but throughout Europe, Japan, China, and Southeast Asia. Is the rain that's falling on your umbrella acidic? A listener's question -- on today's Earth and Sky. J
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本讲为2006年下半年新的教学内容，请对照讲义听声音！ Students(researcher/scholar) of Nature are not satisfied with guessing, but they observe, day after day, the changes which tak
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Earth's 'Bigger, Older Cousin' Maybe Doesn't Even Exist AUDIE CORNISH, HOST: Ever since astronomers started to detect planets beyond our solar system, they've been trying to find another world just like Earth. A few years ago, they announced that the
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