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Science In Action - How would we know if there were previous civilisations on Earth? - 成人快手 Sounds

From: Science In Action

How would we know if there were previous civilisations on Earth?How would we know if there were previous civilisations on Earth?

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If there had been an advanced civilisation on Earth, would they leave a trace?

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How would we know if there were previous civilisations on Earth?
If there had been an advanced civilisation on Earth, would they leave a trace?
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