经济学是一门不精确的科学。

Economics is an inexact science.

《牛津词典》

我并不认为德语是一门容易学的语言。

I wouldn't call German an easy language.

《牛津词典》

有一种趋向认为地理是一门次要的学科。

There is an inclination to treat geography as a less important subject.

《牛津词典》

So thermodynamics, based on these four laws now, requires an edifice, and it's a very mature science, and it requires that we define things carefully.

热力学是一座，建立在这四条定律上的大厦,它是一门非常成熟的科学，也要求我们在定义东西时非常小心。

麻省理工公开课 - 热力学与动力学课程节选

Like, I mean, in my junior year I took a class where there were like six people in the class

就像，我是说，我大三的时候我上的一门课有六个人，

要考入大学 - SpeakingMax英语口语达人

And I think that's very important especially with electromagnetism, which is so numb toward if, so abstract and so much math flowing around.

我觉得这是非常重要的,尤其是对于电磁学来说，它是一门很难懂的，很抽象的学科,包含很多数学在里面。

麻省理工公开课 - 媒体、教育、市场课程节选