I think it's fairly clear that you don't need to appeal to souls in order to do that.

我想大家应该能非常清楚地看到,这样的诉求并非是必须的

耶鲁公开课 - 死亡课程节选

We'll talk about some chemistry today, what DNA molecules are like, why they have the behavior that they do, and you need to understand this in order to understand how you manipulate DNA.

今天我们会谈到一些化学结构,比如DNA分子的形态,它们为什么会以这种形态存在,你必须先掌握这些,才能理解如何操控DNA

耶鲁公开课 - 生物医学工程探索课程节选