| 单词 | a closed book (to somebody) |
| 释义 | a closed book (to somebody) a closed book (to somebody) → a closed book (to somebody) at closed(2) a subject or problem that someone does not know about or understanda closed book (to somebody) |
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英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。