| 词汇 | open book | 
| 释义 | open book  noun uk/ˌəʊ.pən ˈbʊk/ us/ˌoʊ.pən ˈbʊk/ be an open book 是个极坦率的人;是个很容易看透的人 If someone is an open book, it is easy to know what they are thinking and feeling. | 
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