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[選]試 譯 文：Mammals all have a neocortex, so for us, brains are primarily (in some
respects) a question of scale. Our two big developments: opposable thumbs and
a bipedal frame, which ran synchronologically. Opposable thumbs were first
observed in animals from around 60 million years ago – but they could only
really fully develop when they were free to be used, around the time when our
ancestral knuckles stopped scraping the savannah fl oor. As thumbs improved,
we spent less time on our forelegs.
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[選]其他事項：（若未提供請勿刪除）
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