And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

I've passed through Grand Central Station when filming was happening. I don't know what they were filming though.

有一次我从那儿经过，正好有部电影在拍。但我不知道他们在拍什么电影。

电影里的中央车站 - SpeakingMax英语口语达人

I don't know how you think of life insurance salespeople, but they have been pillars of the community.

我不知道你们怎么看待寿险推销员,但他们已然成为了社区的支柱

耶鲁公开课 - 金融市场课程节选

But they didn't really know or care about very much outside of the Mediterranean area.

但他们其实并不知道,也不关心地中海以外的地区

耶鲁公开课 - 古希腊历史简介课程节选

But I mean, yeah, I don't know. They are like teenagers after all really, the same as usual.

但我的意思是，我不知道。他们毕竟都是青少年，跟普通人一样。

有趣的留学生活 - SpeakingMax英语口语达人

So, you're treating healthy people and you're trying to prevent them from getting a disease and you don't know who's going to get it.

所以,你处治的对象是健康人群,要使他们远离疾病,但你不知道谁会被感染

耶鲁公开课 - 生物医学工程探索课程节选

Where--One of the big findings from social psychology, and we'll devote almost an entire lecture to this, that people have strong views about other races that they don't know about and that they don't know how to control their actions.

我们将来几乎会用一堂课的时间，来介绍一个社会心理学的重大发现，人们对其他的民族有极深的成见,但这些成见往往是他们自己无法察觉的,也是他们不知道该如何去控制的。

耶鲁公开课 - 心理学导论课程节选