And a lot of retailers out there are embarrassed by the receipts they give out and the whole payment processing aspect of their business.

很多零售商在生意上,因为在收据,和整个付款过程上的落后,而处境尴尬。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

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。

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