It's reversible, that means that p external, equals p. I'm doing it very slowly so that I'm always in equilibrium between the external pressure and the internal pressure so I can go back and forth.

我都可以不损失能量，而把过程逆向进行,整个过程中的,每一步都保持平衡,现在我们来分别。

麻省理工公开课 - 热力学与动力学课程节选

So it is always the case that I can only know what I know if it's a question of being communicated with, having something rendered intelligible for me, negatively.

所以我们总是这样地认识事物,我们和人交流时，总是被动地认识符号。

耶鲁公开课 - 文学理论导论课程节选