The idea is to take the key features of a physical book, capture those and then go beyond that.

我们的设想是,抽取实体书的关键特性，然后进一步提升它们。

普林斯顿公开课 - 领导能力简介课程节选

The number one feature of a physical book is that it disappears while you are reading it.

一本实体书的最重要的特点是,当你阅读时，它会消失在你眼前。

普林斯顿公开课 - 领导能力简介课程节选