n I know this is okay because I'm not using n until I myself put something there.

我知道这是正确的因为我不会使用,直到我给它赋值了。

哈佛公开课 - 计算机科学课程节选

I like to read because it helps me learn about other things I don't know.

我喜欢阅读，因为它让我了解了许多我不知道的事情。

It's important 实战 - SpeakingMax英语口语达人

Now I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.

现在就能测量这个力了,因为把弹簧拉伸 1 厘米,我就知道它让一个质量已知的物体产生的加速度

耶鲁公开课 - 基础物理课程节选