记录片中，霍金曾一度讲到对于在固体表面进化的任何生命形态而言，脚都是极其重要的。
At one point in the documentary, Hawking describes how feet would be useful for any life form that has evolved on a solid surface.
莫里斯说，与女人不同，男人则进化得为博得女人的关注而相互竞争，对于男人而言，失去高质量的伴侣在一开始“伤害”也许没那么深。
Conversely, as men have evolved to compete for the romantic attention of women, the loss of a high-quality mate for a man may not 'hurt' as much at first, Morris said.
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