在原始人的时代，男人是猎手，要依赖蛋白质来长肌肉，并把肉类看作是战利品。而女人则负责采集水果和蔬菜。

As cavemen, he suggests, men were hunters, relying on protein to build muscles, and seeing meat as a reward, while women were gatherers of fruit and vegetables.

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时代。当你变老，你的肌肉自然会减弱。

Age. As you get older, your muscles naturally become weaker.

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