了解群体差异能帮助我们了解我们的进化历史。
Understanding population differences can help us understand our history.
我们怎么知道不同群体之间，有什么差异呢？
What do we know about human differences? Between different human groups?
在不同年龄群体间最主要的差异是个体担忧的内容。
The primary difference across age groups is in the content of the individual's worry.
个体和群体的反应无明显差异。
There is no obvious difference in the reaction of individual and population.
个体和群体的反应无明显差异。
There is no obvious difference in the reaction of individual and population.
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