closed book

closed book a subject or person about which one knows nothing 完全理解不了的科目; 完全理解不了的人： accounting has always been a closed book to me. 会计学对我来说一直是一门完全理解不了的科目。

• bats in the（或one's）belfry
• methyl red test
• betas
• bacchanalian
• runnable
• （as） pleased as Punch
• concert grand
• swager
• bicycle path
• lithoprint
• tibiotarsus
• Navahos
• oil painting
• neckbreaking
• let it all hang out
• render into
• denominational
• casqued
• piglet
• sozolic acid
• stub nail
• think of
• gnathion
• House Chambers
• unlikely
• anidrosis
• assistant secretary of state
• launch against
• iron metabolism
• interosculates
• ibrds
• stock splits
• Namur
• molar gas constant
• Barbados aloe
• seashells
• olivette
• visceral pleuras
• orthopterous
• Frenchier
• protolanguage
• phenanthridines
• achromato-
• sonar projector
• pungling
• a home from home
• Paradise
• mercy seat
• at danger
• Irene
• close one's doors
• thermodynamics
• Lae
• aerodynamic angle of attack
• for the love of Mike
• arpeggiating
• integralities
• glycosphingolipid
• personal freedom
• Stokes frequencies
• a lie made out of whole cloth
• running story
• philosopher
• bring-and-buy sale
• kokeshis
• degenderizes
• dogsleds
• lanas
• atmospheric noise
• slit skirt
• work both sides of the street
• speak without the book
• kommandaturas
• gun dogs
• Western Empire
• catch some（或a few）Zs
• whistlers
• powder-metallurgical
• Fermi field
• Saturn's moons
• Conodontophoridia
• back East
• for me
• bagbiter
• flesh fly
• be in work mode / holiday mode etc
• clinician
• ostentatiously
• warlordisms
• venter
• threshold values
• Sakta
• draggings
• prologuize
• semipermanent
• whisperies
• twenty-three
• M acid
• aural signal
• Good Samaritan laws