On one level, there are things like companies that have two . different classes of stock that are economically identical.

一方面，我们有这样的例子，有的公司拥有两种,不同类别的股票，他们在经济意义上是相同的。

耶鲁公开课 - 金融市场课程节选

Just as a note, I cued you about the level of detail I'm expecting you to acquire from class and from the readings, and I'm not so interested that you memorize those particular sugars and which category they fall under, but it is interesting to know that there are different types of sugars.

温馨提示,我会告诉大家我希望你们,能从课堂和阅读中学到的知识深度,我并不要求大家记住这些特殊的糖类,以及他们都属于哪个类别,但是知道有不同类型的糖是有必要的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选