So what is this all about? What is an object in object-oriented programming?

所以它到底是什么呢？,面向对象编程中的对象到底是什么呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

Then you start to wonder well what is the system and ? what is it supposed to do?

于是你开始质疑,这个系统到底是什么,还有它到底是要干什么呢？

耶鲁公开课 - 金融市场课程节选

It's hard to explain exactly what it is, It's not getting lost.

很难解释它到底是什么，不是迷途。

普林斯顿公开课 - 人性课程节选

Now I want to really clarify for you what I mean by this term "modernism." It just means the art and literature of the early twentieth century, especially the "high art," although its roots are definitely in the nineteenth century, especially the French nineteenth century, fiction and poetry.

现在我特别想向大家解释清楚,“现代主义“到底是什么意思，它其实就是指,20世界早期的艺术和文学作品，特别是高雅艺术“,尽管它起源于19世纪，特别是19世纪法国的小说和诗歌。

耶鲁公开课 - 1945年后的美国小说课程节选

But what is it?

但它到底是什么呢？

耶鲁公开课 - 现代诗歌课程节选

Still, that's not a world in which the Morning Star doesn't exist, given that what we mean by the Morning Star is that heavenly object, whatever it is, that in this world we pick out at that time in the morning looking up at the sky.

但这并不是意味着,晨星在这个世界不存在,如果给定了晨星的意思就是,一个这样的天体,不管它到底是什么,在这个世界上,在早晨的那个时候我们仰望天空,就能看到的那个天体

耶鲁公开课 - 死亡课程节选