Hold an open book in your hands in front of you and close it quickly. What can you feel?

手中拿一本展开的书放在面前，快速合上书，你能感觉到什么？

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He always took his meals alone, with an open book before him, which he read.

他老是一个人吃饭，面前摊开一本书，从事阅读。

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It's evolved since then into a social network: an open book on its members' lives, welcoming just about anyone.

后来它进化到一个社交网络：一本关于它的成员的敞开的书，欢迎任何人来阅读。

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An open book is before them. They wear the long, full dresses of their day.

VOA: special.2010.04.16

But Adel, the thin young student, was there, sitting alone, an open book face down on his lap.

NEWYORKER: Waiting

What we can also learn is that the web is an open book on people as it is on all companies.

FORBES: What Can Julian Assange Learn from Steve Jobs' Spirit of Innovation?

Here too Mr Ebenstein's quandary becomes clear: Friedman was an open book, a fine expositor of his ideas and his life.

ECONOMIST: Milton Friedman