Well, I've emphasized the non-physical aspect, and I've emphasized as well that they're not changing.

我已经强调了非现实的方面,并且我也强调了他们的不变性

耶鲁公开课 - 死亡课程节选

Now, you all know that we can make irreversible changes in proteins, you can denature them completely, that's what happens when you cook an egg for example.

现在你们都懂蛋白能够发生不可逆的改变,能够完全变性,比如在你煮鸡蛋的时候就是这样

耶鲁公开课 - 生物医学工程探索课程节选