他们一直不愿意接收艾滋病人，部分原因是因为毫无根据对传染的恐惧。

They have been reluctant to admit AIDS patients, in part because of unfounded fears of contagion.

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换句话说，很可能还有一系列其他原因，使得传染病盛行的国家的国民对IQ测试不甚擅长。

In other words, there might be a range of other reasons why people in disease-ridden countries don't excel in IQ tests.

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就同一个笑话大笑能展示我们对别人的接纳和认可，这也许是为什么大笑尤其有传染性的原因。

Laughing at the same joke would help us to show affiliation with others, and this may be why it is especially contagious.

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And so you can see the pneumonia, tuberculosis, the communicable diseases, infectious diseases, for the most part, are taking the most lives at that point.

你可以看到肺炎,肺结核,传染病,感染性疾病,是夺走大多数人生命的主要原因

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And one of the reasons that's most responsible for that is that humans aren't dying at as young an age from infectious diseases as they did three or four hundred years ago.

最重要的一个原因就是,人们不会在年轻的时候死于传染性疾病,而这在三四百年前确实会发生

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