Compared to us, they had larger teeth and stronger chewing muscles, a stouter skull with a smaller brain.Their feet were thought to be very much like ours, suggesting they had mastered bipedalism.
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美
释义
研究人员指出,数百万年前,早期人类学习直立行走的过程并不简单,我们的一些早期祖先还是八字脚。
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