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[期刊论文] 作者：Ｒｕｔｈ Ｋａｓｓｉｎｇｅｒ,
来源：疯狂英语·中学版 年份：2009
Born in Earth Gold formed deep in Earth billions of years ago. Scientists believe that volcanoes may have heated underground water, which melted the gold. Liquid gold then flowed with the water into...
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