我想他们在她动手术前做过了爱。

I think they'd done it before the operation.

youdao

事实上，我们已经这样做过了。

Actually, we've tried this already.

youdao

这个蛋白其实很早就做过了。

The experiment of the protein, as a matter of fact, was made early.

youdao

The passage is also famous because in it Milton does something that he almost never does. Milton has made a mistake.

这篇文章有名也是因为弥尔顿做了一些,他几乎从未做过的事，弥尔顿犯了一个错误。

耶鲁公开课 - 弥尔顿课程节选

So at this point in the story-- at this level in the story, if you will, I've touched one, two, three, four numbers total or I've made two comparisons.

那么这时，我总共已经动过了1，2，3，4个数字,或者说我做了两次比较。

哈佛公开课 - 计算机科学课程节选

In fact, they're no longer capable of reproducing; all they can do is exist as red blood cells and then die.

事实上,红细胞已经不能再增殖了,它们所能做的只是,作为红细胞过完一生然后死去

耶鲁公开课 - 生物医学工程探索课程节选