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1. Oxford American Dictionary

   closed book

   • ph.
     a subject or person about which one knows nothing
2. • 相關詞

   close the books

   • ph.
     make no further entries at the end of an accounting period; cease trading

   Oxford Dictionary

   close the book on

   • ph.
     lay aside; expend no further energy on

   Oxford American Dictionary

3. • 更多解釋

   closed book

   • ph.
     a subject or person about which one knows nothing

   Oxford Dictionary