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[自然百科] 探索世界奥秘之Genghis Khan(成吉思汗)Unit1
In 1162, deep in the heart of Asia, a child was born. He was clutching a blood clot(血块), a sign from heaven that he was destined to be a great warrior. His life was to become a legend, his name---G2008-09-19 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit15
Of course, any terraforming is still a long way off. The next few expeditions to Mars will definitely be made by machines. NASA, are sending 2 rovers, capable of travelling over 100 meters a day in s2008-09-18 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit14
Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At2008-09-17 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit13
Life on Earth is basically proteins and DNA, so we can wonder if there is life on Mars will also be DNA and proteins, the same type of DNA, the same type of proteins. One might think that DNA is such2008-09-17 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit12
But there was something even better. Odyssey may not just have found ice. There may also be liquid water, and that means, there could be living creatures there too. Right now, there might be liquid w2008-09-16 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit11
One of these wavelengths corresponds to hydrogen, another wavelength would be iron. Another wavelength would be oxygen. And so you go to the part of the spectrum you are interested in and you see you2008-09-16 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit10
But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inc2008-09-15 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit09
The ground here is permafrost, a mixture of soil and ice frozen together. A group of Russian scientists have teamed up with NASA to drill down into it in search of microorganisms. It's work tha..2008-09-14 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit08
But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long..2008-09-14 编辑:echo
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[自然百科] 探索世界奥秘之Life On Mars(火星生命)Unit07
Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried2008-09-13 编辑:echo