If you don't have the units, then if you say the answer is 19, then we don't know what it means.

如果没有的话,比如你的答案是十九,那我们就不知道这是什么意思

耶鲁公开课 - 基础物理课程节选

And you remember Yeats in "The Second Coming," - there's a beast that's kind of-- He doesn't know what it is, and here he's saying something similar.

你们记得在二次圣临里“,有提到一只野兽-,他不知道那到底是什么，在此他表达相似的想法。

耶鲁公开课 - 现代诗歌课程节选

He mentioned the Nicomachean Ethics which I have never read I don't know what that is.

他提到了《尼各马克伦理学》,一本我从没读过的书，我不知道那本书是讲什么的。

耶鲁公开课 - 金融市场课程节选

Most people don't even know what that means.

大多数人甚至不知道那是什么东西。

哈佛公开课 - 幸福课课程节选

I don't know what that means-- like God or the gods favor me and so I'm lucky or this is my lucky day.

我不知道那是什么意思...,是说上帝或者众神眷顾我,所以我很幸运,或者说这是我的幸运日

耶鲁公开课 - 金融市场课程节选

I don't know what it means.

我不知道那是什么意思。

哈佛公开课 - 幸福课课程节选