我知道他已经尽力了，尽管如此，他的工作仍不太理想。

I know that he has tried hard; be that as it may, his work is just not good enough.

《牛津词典》

我已经知道这件事了。

I have known this.

youdao

我发誓我已经把我所知道的都告诉你了。

I swear I've told you all I know.

《柯林斯英汉双解大词典》

Didn't I know anything about turn about to right, but now I think I know enough to amuse them and to entertain them.

我从前从不知道这些东西，但现在我已经学的足够多,足够引起他们的兴趣了。

麻省理工公开课 - 媒体、教育、市场课程节选

So it's on the elements on your left that are already known to be the lightest 'cause I did that.

现在已经知道在你们左边的元素,是最轻的，因为我已经比较过了。

哈佛公开课 - 计算机科学课程节选

Now, you know already, or you could review in Chapter 4 that I provided to you, something about how proteins work.

现在你们已经知道,或者读我给你们看的第四章,就能了解蛋白质的工作原理

耶鲁公开课 - 生物医学工程探索课程节选