Does anyone have that in their brain somewhere for ready use? I don't, in fact, so it's actually okay if you don't know all your common ions, if you missed that part.

你们有谁有印象它们有什么用吗？,我当时是不知道，所以如果你们不记得,这部分也没有关系。

麻省理工公开课 - 化学原理课程节选

But I don't really know 'cause he didn't have the Internet. See?

但我不知道具体的结果，因为他不能使用网络。明白了吗？

理想是当密码专家 - SpeakingMax英语口语达人

Professor Paul Bloom: I don't know if that's--The question is, "Is there a difference between smiling with your teeth versus just your lips closed?"

我不知道是否，问题是，微笑露齿与不露齿有不同吗“

耶鲁公开课 - 心理学导论课程节选

And don't you know--Listen to me, now.

你们不知道吗，现在听我说。

耶鲁公开课 - 1945年后的美国小说课程节选

A person of character." Oh, I don't know.

高尚的人格吗,我也不知道

耶鲁公开课 - 美国内战与重建课程节选

Because of course,if I haven't had it no wonder I don't remember it but if I have had it,I would have been given that temporary sort of localized amnesia So of course I wouldn't know whether or not I've had it So you ask the nurse ?" "Have I had the operation yet or not?"

因为如果没有手术,难怪我不记得了,但如果手术了，我会被给予那种,短时间的局部失忆药物,所以当然我不知道有没有做了,你就问护士,“我做手术了吗“

耶鲁公开课 - 死亡课程节选

" "I don't know. Is it warm in here?"

我不知道，这里很热吗“

耶鲁公开课 - 心理学导论课程节选