| 词汇 | is a closed book |
| 释义 | (redirected from is a closed book)be a closed bookTo be difficult to know or understand. She's such a private person that I don't know much about her. I guess she's a closed book. I'm a scientist through and through, so art has always been a closed book to me. |
| 随便看 |
|
青年旅行网英语在线翻译词典收录了440382条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。