The meaning of Closed-book

Closed-book – definition

noun
A subject about which you know or understand nothing
Usage examples:
I'm afraid physics will always be a closed book to me.

闭卷式

Gesloten boek

Livre fermé

Geschlossenes buch

बंद किताब

Libro chiuso

비공개 책

Закрытая книга

Libro cerrado

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