An insurance policy--the concept is very simple, we could talk about fire insurance or life insurance.

保单的概念其实很简单，我们可以谈谈火灾保险，或者人寿保险。

耶鲁公开课 - 金融市场课程节选

Because of that you can do the following experiment, and it's a simple experiment, it's simple to understand, but the concept is very important so I encourage you to think about it and make sure you understand it.

我们可以做一个实验,这是一个非常简单容易理解的实验,但是这个实验验证的概念非常重要,我希望你们能够仔细思考,并且能够掌握

耶鲁公开课 - 生物医学工程探索课程节选