约翰逊在一封电子邮件中说，以目前人类的足迹来看，“似乎全球崩溃肯定会以某种形式发生，可能在未来10年内，但肯定在本世纪内。”

With the current footprint of humanity, "it seems that global collapse is certain to happen in some form, possibly within a decade, certainly within this century," Johnson said in an email.

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除此之外，史前人类使用的技术看起来比较简陋。

Beside this, prehistoric man looks technologically primitive.

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史前人类从未向雷克斯暴龙扔过长矛，但确实猎杀过猛犸象和乳齿象。

Prehistoric humans never threw spears at Tyrannosaurus rex but really did hunt mammoths and mastodons.

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Aristotle, over 2000 years ago, "Happiness is the meaning and purpose of life, " the whole aim and end of human existence."

二千多年前的亚里斯多德，“快乐是人生的意义和目的，人类存在的最终目标“

哈佛公开课 - 幸福课课程节选

There are lots of people who have pointed out to us that before a certain period, there was no such thing as man, and in a variety of quite real senses, after a certain moment in the history of culture, there is also no such thing as man.

很多人向我们指出,在某一特定时间点前是没有人类的，而且在真实意义上，在文化史中的某一特定时刻后，人类也不存在。

耶鲁公开课 - 文学理论导论课程节选

A human cell shown here on the opposite side has these formed organelles that I talked about a minute ago, mitochondria, Golgi, endoplasmic reticulum, nucleus.

另一边展示的是人类细胞,它带有我一分钟前讲过的成形的细胞器,线粒体,高尔基体,内质网,细胞核

耶鲁公开课 - 生物医学工程探索课程节选