猫不明白这个笑话，扑向他的脸，对他又是吐口水，又是抓挠。

The cat, not understanding this joke, sprang at his face, and spat, and scratched at him.

youdao

我回过头看了看，不明白这个问题。

I stared back, not understanding the question.

youdao

史密斯先生不明白这个陌生人是怎么找到路的。

Mr. Smith couldn't understand how the stranger found his way.

youdao

Dakota And this is one of them from 2002 called Dakota, and I think you will see immediately how and why it is related to On the Road.

而这个作品是其中2002的系列之一叫做，我想你们能很快地明白,这个作品和《在路上》有什么样的关联。

耶鲁公开课 - 1945年后的美国小说课程节选

And that's really neat to think about, because photons, of course, are massless particles, they have no mass, so it's neat to think about something that has no mass, but that actually does have a momentum.

而且那真的不容易想明白，因为光子，当然是无质量的粒子，它们没有质量，所以这个真的不容易想明白,一些物体没有质量，但是它们事实上确实有动量。

麻省理工公开课 - 化学原理课程节选

OK. Now, that's a nice simple little test, let's look at a couple of other examples to get a sense of what this will do.

好，那么这是一个很好的小测试，让我们看看其他的一些例子,来明白这个主要用来做什么的。

麻省理工公开课 - 计算机科学及编程导论课程节选