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树木是怎么变成纸张的？蚕茧是怎么变成丝绸的？钱是像报纸一样印刷的吗？各种各样的笔是如何制造的？古代的碗和鞋又是什么样的？
每一个物品的背后，都隐藏着一个无限精彩的大世界！
每一个物品的背后，都隐藏着一个无限精彩的大世界！
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