a closed book (to sb)

a closed book (to sb) a subject or problem that someone does not know about or understand（某人）一无所知（毫不理解）的学科（问题）:•Mathematics has always been a closed book to me.我对数学一向是一窍不通。a closed ˈbook (to sb)a subject or person that you know nothing about一窍不通的事物；不了解的人

• speedskater
• cheating in gambling
• half the battle
• pedestrianisms
• copyleft
• autogenic
• tell against
• surtouts
• Chads
• floatstones
• nitric acids
• exoticas
• impressionist
• ironed
• in repose
• immigrator
• hold someone by the button
• pelham
• exogenous inclusions
• roisterer
• elvan
• unshackling
• outcurve
• outstay one's welcome
• middle irishes
• wave-hopper
• myodystrophy
• variational principle
• civil society
• radiation pyrometer
• deipnosophists
• change of clothes / underwear etc
• airshipped
• decriminalisation
• call-boards
• Landau fluctuations
• amexed
• semiliquidity
• Castlereagh, Robert Stewart Viscount
• deluded
• creodonts
• in the melting the melting-pot
• decivilization
• stand on/upon one’s dignity
• titivation
• golden nematode
• gopaks
• masseter
• carboxyl
• handfree interphone
• all manner of sth
• man-month
• get one's flag
• provisional unit
• erythema pernio
• turn one’s hand to
• hexylic
• genteelisms
• stilbs
• lay-up
• sword swallower
• the Whore of Babylon
• cut it（或 things）fine
• the help
• english sparrows
• rough lay-out
• a day's grace
• transfer unit
• small slams
• coding triplet
• trundlers
• debauchedness
• dead men's shoes
• laugh ... out of
• transfusion tissue
• Official Solicitor
• play it by ear
• wing nuts
• unrest
• bristlelike
• plateaux
• man-day
• adiponitriles
• ogled
• triaxiality
• Godunov, Boris Fedorovich
• permutates
• exanimation
• orientational
• make sthdo
• pyin
• distinguish between
• cogitability
• pilot whales
• Iliad
• short leet
• Parasympathetic Nervous Systems
• casualization
• Assurbanipal
• decontamination factor