你一旦具此能力，便不会怀疑你一度曾信以为是自己念头的一切， 实际上不具任何意义。

When you do, you will have no doubt that what you once believed were your thoughts did not mean anything.

youdao

我曾跟自己的良知斗争应否真的寄出这封信。

I have battled with my conscience over whether I should actually send this letter.

《柯林斯英汉双解大词典》

在发现这封信之前，我曾自问：在什么情况下一部书才能成为无限。

Before I discovered this letter, I kept asking myself how a book could be infinite.

youdao

Well, for the answer to that we have to go back to ancient Greek music theory, and when you read about this--it's really turgid stuff-- but believe it or not, I teach a course on this at the graduate level.

这个,要回答那个问题,恐怕要追溯到古希腊的音乐理论,每次读这些都会云山雾罩的,不管你信不信,我曾在研究生中开过这个课程

耶鲁公开课 - 聆听音乐课程节选