Let's assume that we know that this thing is going to be paid, so it's a matter of simple time.

我们假设这份承诺会被兑现,这只是时间的问题

耶鲁公开课 - 金融市场课程节选

This is a matter of simple algebra, of taking this and putting it here.

本质上讲,这是简单的代数运算,把这个式子代入上面的式子

耶鲁公开课 - 基础物理课程节选

But a lot of the inventions that matter to us are extremely simple.

但是很多发生在我们身边的发明,都是极其简单的。

耶鲁公开课 - 金融市场课程节选