English version

a closed book

From Longman Dictionary of Contemporary Englisha closed booka closed bookUNDERSTANDa subject that you do not understand or know anything about Chemistry is a closed book to me. book
Examples from the Corpus
a closed bookBut your own past can be a closed book, even at fourteen.The Shoah will never be a closed book.He is holding a closed book, signifying a mystery, possibly a stage in the alchemical process.The kitchenette is a closed book.Linear preoccupation in the past remains a closed book to modern understanding.I tell myself it's a closed book, but my cover story becomes an old man's compensation.I can not believe that it can be right that this late in the game Poetry is still a closed book.The highly organised St Stephen's Society programme which she now leads was at that time a closed book to her!
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