“这就是为什么我们不能只把重点放在如何应对灾害，我们必须这样做，但更重要的是在灾难发生前如何减少其破坏影响，”霍尔姆斯说。

"That's one of the reasons we want to focus on not just how we respond to disaster, we need to do that, but how you reduce the impact of those disasters before they happen," Holmes said.

youdao

例如，全世界大部分人都知道袋鼠和树熊，但知道为什么这些动物只长在澳大利亚的人并不多。

For example, most people throughout the world know of the kangaroo and the koala but not many people know why these animals only exist in Australia.

youdao

为什么我们有两只眼睛，两只耳朵但只有一张嘴？

Why do we have two eyes, two ears and only one mouth?

youdao

We'll think about it in section, how you don't need to vaccinate everybody, but you just need to vaccinate a critical number in order to stop the disease from progressing through a community.

我们在讨论会上讲这个,为什么不需要给每个人都接种,但你只需要让接种人数达到一个临界值,就能阻止这个疾病在社会中传播

耶鲁公开课 - 生物医学工程探索课程节选