The frescoes portrayed scenes of ancient human life. 這些壁畫表現了古人類的生活場面。
But the tools of biotechnology have become so powerful that it's now possible to deduce ancient human history from a drop of blood or a few shed skin cells. 但是生物技術工具已變得如此強大，現在只要有一滴血或幾片蛻皮細胞我們就能推斷出古人類的歷史。
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