So I talked about some of "the greatest hits": the importance of gratitude, the importance of physical exercise.

于是我谈到了一些热门话题：,感恩的重要性，体育锻炼的重要性。

哈佛公开课 - 幸福课课程节选

How many people know that three times a week physical exercise,30 minutes each time has the same effect ? as our most powerful psychiatric drugs?

多少人知道，每周三次,体育锻炼，每次三十分钟，与最强劲的精神药物,有同样的效果？

哈佛公开课 - 幸福课课程节选