当他还是个小孩子的时候，我有一次曾经帮他做数学题。

When he was little I helped him with math problems once.

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里根有一次曾经说道：“有时我在办公室里真的很好奇：如果不是我当过演员的话，怎么可能胜任这份工作。”

Reagan once commented, “There have been times when I’ve wondered in this office how you could do this job if you hadn’t been an actor.” Even George Washington put theatrics to good use.

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年仅22岁却身为社交网站Facebook创始人兼CEO的马克 扎克伯格，在谈到一次曾经被枪管指着的经历时这么说到。

Mark Zuckerberg, the 22-year-old founder and CEO of social-networking site Facebook, is talking about the time he came face-to-face with the barrel of a gun.

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There has been a long discussion about what people owe each other and how okay it is to try to make money.

曾经有一次很长的讨论,是关于自己欠别人多少,而自己应该赚多少才合适

耶鲁公开课 - 金融市场课程节选

But there's extra, again, insult to injury, when the person's got to remember that he used to be something extraordinary, a ruler.

但当这人不得不记着，他曾经位高权重，是统治者的时候,这又一次，是在伤口上撒盐。

耶鲁公开课 - 死亡课程节选

And I hope, as you are reading, you notice that chapter opening where once again Dean appears at the door when Sal shows up, and he's totally naked.I hope you noticed that. It's the third time that we see that so there is an eroticism between them.

我也希望，你们在阅读时注意到那一章,就是曾经萨尔去找迪安时，迪安又一次是光着身子，开的门，我希望你们注意到这一点，这是第三次,我们看到这一幕，所以他们对彼此有着性欲。

耶鲁公开课 - 1945年后的美国小说课程节选