Open book
open book
一目了然的事物，易于了解的人，极坦率的人
This phrase means that the whole story of the things is very clear and easy to understand.
这个短语常用来形容事物、事情原委很清晰，一看就知道是怎么回事。
He is an open book. And it's easy to know his feelings and thoughts.
他很坦率，很容易就能看出他的情绪和想法。
My life is an open book and I have no secret.
我的生活很明了，没有秘密可言。
