| 单词 | a closed book |
| 分类 | 翻译、意思、用法、释义、英译汉、汉译英、英汉双解词典 |
| 释义 | a closed book a closed book1 → a closed book at book1(3) a subject that you do not understand or know anything about2 → a closed book (to somebody) at closed(2) a subject or problem that someone does not know about or understanda closed book |
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英语词典包含340727条英汉在线翻译词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。