bipedalism

We think about the evolution of bipedalism as one of first events that led hominids down the path to being human.

双腿直立行走的进化是原始人向人类进化的最初阶段中的一步.

《简明英汉词典》

Bipedalism made the human form of birth possible.

直立行走让人类的出现成为可能.

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