I've been using the blackboard a little ad hoc here, but suppose I neaten things up here now and present this rectangle is let's say R RAM, the memory inside of your computer.

我在这里特别地使用这块黑板，假如我整理这些东西，把它们呈现,这个长方形，假如说就是内存，你电脑的内存。

哈佛公开课 - 计算机科学课程节选

This point here then is the present value of your income; it's Y today + / .

直线与x轴的交点表示收入的现值,它等于

耶鲁公开课 - 金融市场课程节选