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钉子——从奢侈品到走入寻常百姓家
现如今，钉子早已深入我们生活中的各个角落，床、衣柜、沙发、椅子……几乎所有的家具里都有它。但你可能想不到，过去的钉子可是名副其实的“奢侈品”。（出品：科普中国-星空计划）
科普中国 星空计划171/251
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