| 单词 | closed book |
| 释义 | closed book < railway operation is a closed book for many people — O.S.Nock > : something that resists clarification < a modern age in which the law is a closed book — B.N.Cardozo > |
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英语词典包含332784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。