Sure, if my son would wake up and I didn't tell him, he wouldn't know that it was duplicate.

当然，如果我儿子醒来,可我还是没告诉他，他不会知道这塔是重新搭的。

耶鲁公开课 - 死亡课程节选

Oh yeah, I know Hanson, but if I didn't know him, I wouldn't know any farmers.

好吧,我知道汉森,但我不认识他,我一个农民都不认识

耶鲁公开课 - 古希腊历史简介课程节选