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单词 a closed book
释义

a closed book

: a person or thing that is difficult to understand难以理解的人(或事物)
compare an open book (below)
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英汉双解词典包含109353条英汉词条,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。

 

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更新时间:2025/3/13 13:42:52