| 短语 | a closed book (to sb) |
| 释义 | a closed book (to sb) a subject or problem that someone does not know about or understand（某人）一无所知（毫不理解）的学科（问题）:•Mathematics has always been a closed book to me.我对数学一向是一窍不通。a closed ˈbook (to sb)a subject or person that you know nothing about一窍不通的事物；不了解的人 |
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英语短语词组词典共收录525608条英汉双解短语词组词条，基本涵盖了全部常用短语词组的翻译及用法，是英语学习的有利工具。