The reason why we need positive psychology is to shift the pendulum from the 21:1 ratio that we have today: for every one study on depression or anxiety, we have 21 studies on-- sorry, for one study on happiness or wellbeing, we have 21 studies on depression and anxiety.

我们需要积极心理学是为了改变,现在的21比1这个比率：,每有一项关于抑郁或焦虑的研究，就有21项，对不起，应该是每有一项关于快乐或幸福的研究，就有21项关于抑郁或焦虑的研究。

哈佛公开课 - 幸福课课程节选