骨头成为化石需要多少年?为何会石化呢?
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![骨头成为化石需要多少年?为何会石化呢?](/uploads/image/z/2198729-65-9.jpg?t=%E9%AA%A8%E5%A4%B4%E6%88%90%E4%B8%BA%E5%8C%96%E7%9F%B3%E9%9C%80%E8%A6%81%E5%A4%9A%E5%B0%91%E5%B9%B4%3F%E4%B8%BA%E4%BD%95%E4%BC%9A%E7%9F%B3%E5%8C%96%E5%91%A2%3F)
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