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小学科学知识趣味学17：什么是化石
这一天，大雄和哆啦A梦碰见一个老爷爷，他拿着小榔头在山壁上敲敲打打，于是好奇地过去询问。原来他是一名古生物学家，他觉得这里可能会挖到化石...
小学科学知识趣味学17/81
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