Information from the Framingham study showed earlier that happiness can spread from person to person.

VOA: special.2009.12.22

I want to end this premise idea by talking a little bit about a person for whom, one of the chief purpose in life was to spread happiness-- Mahatma Gandhi. This is a story about him.

我想以介绍一位,一生致力于，传播快乐的人来结论这个前提-,圣雄甘地，这是关于他的一个故事。

哈佛公开课 - 幸福课课程节选

As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.

有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播

耶鲁公开课 - 生物医学工程探索课程节选