人类以前一直都要面对环境变化。
第一头母狼一度允许杰米在她生小狼后进入狼窝,因为母狼将生产作为秘密的事,人类以前从未尝试过这种行为。
At one point, the alpha female allowed Jamie to enter the wolf den after she gave birth to pups -- behavior never previously attempted by humans since female wolves keep the birthing process private.
我们的身体比以前差,这就是因为我们现在的生存环境和人类以前的生存环境有很大的不同。进化是人类为了适应野外的恶劣生存环境而产生的。
Our own bodies are worse off than most simply because of the many differences between the wilderness in which we evolved and the modern world in which we live.
Over the last couple of years, we can get reasonable measurements of human activities that were hidden from us.
在过去的几年中,人类能够通过适当的方式去测量人的大脑,在以前我们根本无法做到。
His view is man was happy and good before the invention of society, which society corrupts man and takes away from him his happiness.
他认为在社会形成以前,人类是幸福快乐的,社会使人类堕落并剥夺了人们的幸福
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