儿子，我不知道你怎么能吃这么多，还一点都不长胖。

I don't know how you can eat so much yet never put on any weight, son.

youdao

男人甲：我不知道你还喜欢耳环呢。

Man a: I didn't know you were into earrings.

youdao

你正在宣誓加入姐妹会，或者和你男朋友在一起，或者我甚至不知道你还做什么。

You were pledging your sorority. Or with your boyfriend or I don't even know what else you do.

youdao

It's just a placeholder that says I don't yet know what I wanna put here but I wanna put something, let me get back to you in just a moment.

它只是一个占位符，告诉电脑,我想在这放一个东西，但是暂时还不知道放什么东西，我先打断一下。

哈佛公开课 - 计算机科学课程节选

I didn't know what else to do, and I read one book that really influenced me.

我当时不知道还能干什么,所以就读了本对我影响深远书

耶鲁公开课 - 1871年后的法国课程节选

Though at that time I didn't realize it was going to last 16 years or longer.

我还不知道它能用,16年以上。

耶鲁公开课 - 死亡课程节选