人类是怎样发现和记载自然数的
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![人类是怎样发现和记载自然数的](/uploads/image/z/1743544-64-4.jpg?t=%E4%BA%BA%E7%B1%BB%E6%98%AF%E6%80%8E%E6%A0%B7%E5%8F%91%E7%8E%B0%E5%92%8C%E8%AE%B0%E8%BD%BD%E8%87%AA%E7%84%B6%E6%95%B0%E7%9A%84)
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