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恐龙世界/方法
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摘自 Wikibooks,一个开放世界的开放书籍
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世界大恐龙
科学家如何判断什么是骨头,什么是石头呢?答案就在舌头上。由于骨骼的多孔性,它会粘在你的舌头上。
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书:世界大恐龙
华夏公益教科书