So if you think of the effect of technology on the different populations, the young-age and the adult-age learners.

所以在思考技术对,不同人群的影响时，要想到青年和成年学者。

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You want to give it to people in different communities, to make sure that it works in all the subpopulations where the vaccine's potentially valuable.

研究者希望将疫苗分接种于不同人群,以确保疫苗适用于所有人,这样才能体现疫苗的价值

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But it's all different degrees of terrible, if you will, because so many people in the population share that biological vulnerability and when the environment changes, we have the problems.

只要愿意,这造成的恐慌程度是不同的,因为在人群中有很多这样的群体,他们都有这种生物易损性,当环境发生变化时,就会出现问题

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" Why do different human groups differ in intelligence?"

为什么不同人群之间会有智力差异“

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