Why does every mammal get 1 billion heartbeats in their life? - YouTube封面下載 - TubeSnap | TubeSnap

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Why does every mammal get 1 billion heartbeats in their life?

Why does every mammal get 1 billion heartbeats in their life?

Veritasium tL9Lw250spc

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作者：Veritasium

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最後提取：2026-07-31 19:54:56