3 Example Sentences Showcasing the Meaning of 'Closed Book'
Quantum physics remained a closed book for many, as the concepts delved into the mysterious nature of the subatomic world.
Despite countless attempts, the alien technology was a closed book to Earth scientists, leaving them puzzled and intrigued.
The encrypted message proved to be a closed book for the codebreakers, requiring exceptional skills to decipher its meaning.
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