That may or may not work -- I'm not optimistic -- but at least it's the same idea. We're changing payoffs.

这似乎无济于事,我对此也并不乐观,但至少我们得承认,它改变了收益

耶鲁公开课 - 博弈论课程节选

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

But the message isn't that optimistic sort of that life is short, enjoy it. It's more that the past is no good to us and we can't rekindle the past.

但是其所传达的信息并不是乐观的，不是那种,生命短暂，尽情享受的想法，此外,过去于我们无益，我们也无法使昔日之火复燃。

麻省理工公开课 - 电影哲学课程节选

It's optimistic, but not wildly optimistic.

是乐观，但不是过于乐观。

耶鲁公开课 - 死亡课程节选