一个我曾经知道的理发师从7,8个亲戚那里借钱来经营一家理发沙龙。

One hairdresser I know borrowed money from seven or eight relatives to open her own salon.

youdao

我不知道美国农业部曾经有一位研究肠胃胀气的专家。

I didn't know the U.S. Department of Agriculture once had a flatus researcher.

youdao

现在，我想知道你是否曾经独立工作过。

Now, I'd like to know whether you've ever worked independently.

youdao

Interestingly, towards his death, I had the chance to meet him, And I asked him... He knew he was dying.

在他去世前，我曾经去拜访他，我问他。。。，他知道他就要离开人世。

普林斯顿公开课 - 人性课程节选

But if you want to know the answer, and I knew it, but I forget what it is-- it doesn't matter.

如果你想知道答案,我曾经是知道答案的,不过我忘掉了,这不重要

耶鲁公开课 - 心理学导论课程节选

I don't know if I'd eat it if it were put in front of me, but anyways, I'm told that it looks something like this, that you have the custard with little fragments of plum inside.

我不知道,就算这东西曾经放在我面前，就算我吃过它，但是无论如何，但是有人告诉过我有些东西长得像这样，如同在一些小块的梅子,放在乳蛋糕里面。

麻省理工公开课 - 固态化学导论课程节选