open book

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释义
极其坦率的人，容易理解(或了解)的人
A person who through naivete responds candidly to questions or openly displays their emotions or intentions.

例句
Tripp: And what do you gather from all this reading?
Jane: Well, you're an open book. (The Mentalist)
特里普：你从读心术里了解到了什么呢？
简：你是个极其坦率的人。（超感神探）