That's important, too, because you need to be able to tell if the virus is present in the human population.

这一点也非常重要,因为你要能够分辨出,人群中是否有人感染了天花病毒

耶鲁公开课 - 生物医学工程探索课程节选

Now because it is so important to understand how the neurons present the information, ? let me go into a bit more detail. Ok?

既然要理解,神经元传递信息是如此重要，我来更加详细地解释一下，好吧？

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There are all kinds of different definitions and companies like to do it their own way because they want to present themselves in the best way to the public.

有各式各样的框架,公司可以任意选择,因为公司都希望,对外表现自己最好的一面

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But I'm going to present this as an example here because it illustrates so many of the Freudian themes, particularly themes about dreams, the importance of dreams, about repression and about hidden meaning.

但我之所以要举出这个例子,是因为它展示了大量精神分析理论的主题，特别是关于梦境，梦的重要性，梦的压抑及其隐含意义这样的主题。

耶鲁公开课 - 心理学导论课程节选

You could use PCR to do that because if you amplify a gene in PCR, that gene had to be present from the beginning.

你可以用PCR技术来鉴定,因为如果你能用PCR扩增某一段基因,说明它从一开始就肯定是存在的

耶鲁公开课 - 生物医学工程探索课程节选