如今，我是一个非常自信和乐观的人。

Today, I'm a very confident and optimistic person.

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之前的很多研究已经发现，越乐观的人得慢性病的风险越低，过早死亡的风险也越低。

Previous studies have found that more optimistic people have a lower risk of developing chronic diseases, and a lower risk of premature death.

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数年前一个炎热的日子里，我那上中学的女儿艾米丽——我所认识的最乐观的人之一，和我一起参加划纸板船比赛。

On a hot day many years ago my the-middle school daughter Emily, one of the most optimistic people I know, was paddling with me in a cardboard boat race.

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Here you have somebody who's happy, at ease, and completely secure that there will be food around the corner.

右边的人轻松乐观,百分百确信面包总会有的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I try to look on the bright side. I try to not be a downer.

我试着乐观一点。试着不去做一个扫兴的人。

幸福的定义 - SpeakingMax英语口语达人

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