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奇形怪状的土堆
2007-11-01 10:16:55
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    WASHINGTON — Strange-shaped mounds (土墩) of dirt in Australia turned out to be fossils of the oldest life on Earth, created by billions of microbes (微生物) more than 3 billion years ago. And these mounds are exactly the type of life astrobiologists (天体生物学家) are looking for on Mars (火星)and elsewhere.

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