What is inescapable is farmers are a sociological category of people, different from non-farmers in all kinds of critical ways, and it is just an example of how this whole business has disappeared.

不可否认的是,农业人口是一种社会学对人口的分类,和非农业人口是完全不同的,这只不过是,整个产业走向消亡的一个例子罢了

耶鲁公开课 - 古希腊历史简介课程节选

So, it's a very complicated industry.

因此，这是一个很复杂的产业。

耶鲁公开课 - 金融市场课程节选

And there's a huge industry with DVDs and flash cards and all sorts of things designed to teach your children language.

设计来教授儿童语言的,DVD和闪存卡以及其他存储,形成了一个庞大的产业

耶鲁公开课 - 心理学导论课程节选