当我们回顾时,我们发现越来越多的人们中间如群居动物般的部落;
As we go back, we find more and more in men the traits of gregarious animals;
然而,当我们教授历史时,我们只是在回顾过去。
However, when we teach history, we are just looking back at the past.
但特别是当我们回顾美国动荡的过去时,今天的社会指数很难表明一个黑暗和恶化的社会环境。
But particularly when viewed against America's turbulent past, today's social indices hardly suggest a dark and deteriorating social environment.
And so far when reviewing the developmental data we've talked about two of them: physics and people.
到目前为止,当我们回顾发展的数据时,我们讨论了其中的两个主题,物理学和人类
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