Standing up on their hind legs allowed our ancestors to fight with the strength of their forelimbs, making punching much more dangerous.

此外，专家还说，我们祖先在进化到二足动物时期的时候，凭借着“后肢动物”的优势更容易打败“前肢动物”，因为从上至下出拳力量会更大。