这就是为什么许多病毒，如麻疹，只会使我们生病一次。

This is why many viruses, such as measles, make us ill only once.

youdao

太空也有高等级的辐射，其能量可以穿过我们的身体，让我们生病。

Space also has high levels of radiation, energy that can pass through our bodies and make us sick.

youdao

我们生病时服用的药物中有25%是由只生长在热带雨林中的植物制成的。

25% of the drugs we take when we are sick are made of plants that grow only in rainforests.

youdao

But it means that we get ill less often and when we do get sick, we recover more promptly.

但这意味着我们不会常生病，就算病了，也能恢复得更快。

哈佛公开课 - 幸福课课程节选

What he means is that we are ill because we do not cultivate what we are about enough.

他是说，我们正在生病，是因为我们没有,尽力做好我们本该做到的事。

哈佛公开课 - 幸福课课程节选

Children get diseases from a class of viruses called rotaviruses, for which we have no vaccine, and- and so no way to protect them.

儿童因轮状病毒而生病,而我们没有针对这种病毒的疫苗,所以,所以我们没有办法保护儿童

耶鲁公开课 - 生物医学工程探索课程节选