英语词汇“a closed book”的翻译、意思、用法、释义-英汉双解词典-初中学习网

单词	a closed book
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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