| 单词 | closed book |
| 释义 | closed book ˌclosed ˈbook noun [S] INFORMAL ► F0 a subject about which you know or understand nothing: » I'm afraid physics will always be a closed book to me.Thesaurus+: ↑Difficult to understand , ↑Complicated and difficult to do , ↑Puzzle and confuse |
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英语词典包含67674条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。