Some cesareans are medically necessary. But in other cases, women just want the convenience of knowing when they will give birth.

VOA: standard.2010.06.30

Now, we are very gentle in this course with respect to knowing integrals, but this is one you have to know.

这门课对积分,的要求并不高，但这个积分你们必须会算。

麻省理工公开课 - 热力学与动力学课程节选

So it's a useful way of not quite knowing in advance what you want to put in a string, but being able to create strings, phrases, sentences, dynamically.

这是一个很有用的方法，如果你之前不是很了解,在句子中要加入什么，但是这个方法可以,动态地创建字符串，短语，句子。

哈佛公开课 - 计算机科学课程节选

"But I like the concept of knowing something in class but then going back and pressing pause or rewind and actually getting a deeper understand of it."

VOA: standard.2010.03.26

But you're not responsible for knowing specifically that it's 11 . 5 times greater.

但你们不需要记住它,具体是１１．５倍这么大。

麻省理工公开课 - 化学原理课程节选

Knowing what iambic pentameter is, is not a gift of birth, but rather something that comes through a little bit of practice, which means we have to work at it a little bit.

没有谁是生来就知道抑扬五音步格诗，是需要努力才能知道的，这说明我们必须在这个上面花点功夫。

耶鲁公开课 - 现代诗歌课程节选

As shown in this cartoon here, again you don't need to know the details of this, but if you're interested in knowing what's the biological bases of the genetic code this is it.

像这个动画里画的那样,这里你也不需要了解细节,不过如果你很有兴趣想知道,遗传密码的生物学基础

耶鲁公开课 - 生物医学工程探索课程节选

It's still calling cmp, but it's knowing that cmp is just reversing the order of the arguments.

下一次我会带上正确的眼镜的，这还是会去调用cmp方法的,但是我们知道。

麻省理工公开课 - 计算机科学及编程导论课程节选