However,its greatest hits were used in the popular musical show "Mamma Mia" which opened on Broadway in two thousand one.

VOA: special.2010.03.19

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