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[期刊论文] 作者：Ｋｅｒ Ｔｈａｎ,
来源：疯狂英语·中学版 年份：2009
1)Meteorites on the ground or icy comets millions of miles away are usually the only sources of ancient matter from the early days of the solar system. But in a high-flying experiment, researchers h...
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