4 Example Sentences Showcasing the Meaning of 'Closed Book'
The ancient artifact's purpose remained a closed book to archaeologists, leaving them puzzled and intrigued.
The chef's secret recipe for the signature dish was a closed book, guarded with utmost confidentiality.
Despite extensive research, the origins of the ancient language proved to be a closed book to linguists, leaving them with unanswered questions.
The encrypted message was akin to a closed book, challenging cryptographers to unravel its hidden meaning.
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