Moderate as in conundrum A mystery or enigma, similar to a riddle, that is difficult or impossible to understand or decipher. Clear All
2 Example Sentences Showcasing the Meaning of 'Closed Book'
Trying to comprehend the complexities of quantum mechanics can make even advanced students feel like they are facing a closed book.
For the curious teenager, quantum physics remained a closed book, filled with complex equations and abstract concepts.
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