Perhaps you are a little bit more optimistic, a little bit more utopian-- human nature can be improved.

也许你更乐观，更加乐天，人性可以改善。

哈佛公开课 - 幸福课课程节选

Optimistic people, and again, not Pollyannaish detached optimism, but grounded optimists, on average, live significantly longer.

乐观的人，不是指盲目的乐天派，而是脚踏实地的乐观主义者，平均而言，明显更加长寿。

哈佛公开课 - 幸福课课程节选

Kind of an optimistic, I suppose?

我猜有点乐天派？

哈佛公开课 - 幸福课课程节选