| 单词 | closed book |
| 释义 | Word Frequency closed booknoun 1. something deemed unknown or incapable of being understood 2. a matter that has been finally concluded and admits of no further consideration |
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英语词典包含233703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。