2SHUT/CLOSE[not before noun] if a shop, public building etc is closed, it is not open and people cannot enter or use it 〔商店、公共建筑等〕关门的,不开放的SYN shutOPP open
The shops here are closed on Sundays.
这里的商店星期天关门。
closed to the public/visitors etc
The castle is closed to visitors in winter.
这座城堡冬天不对游客开放。
3LIMITrestricted to a particular group of people 只限于特定人群的OPP open
6a closed book (to somebody)NOT KNOWa 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.
我对数学向来一窍不通。
Examples from the Corpus
a closed book (to somebody)• I can not believe that it can be right that this late in the game Poetry is still a closed book.• The kitchenette is a closed book.• The Shoah will never be a closed book.• I tell myself it's a closed book, but my coverstory becomes an old man's compensation.• But your own past can be a closed book, even at fourteen.• He is holding a closed book, signifying a mystery, possibly a stage in the alchemical process.• The highly organised St Stephen's Societyprogramme which she now leads was at that time a closed book to her!• Linearpreoccupation in the past remainsa closed book to modernunderstanding.
7a closed set (of something)a restrictedgroup, or a group that cannot change or grow 一成不变的某物
The law is not a closed set of rules and principles.
closed to the public/visitors etc• But whoever the mysterybuyer is, the manor will remainclosed to the public.• Still being restored, over half the Catherine Palace is closed to the public.• The carpets were laid on a Sunday when the Palace is closed to the public.• Those roads, built for management and law-enforcement purposes, are closed to the public.• The meeting was closed to the public, and journalists watched the proceedings on closed-circuit television.• Greenwich Park is closed to the public, but there is limited car parking around Blackheath.• Althorp is closed to the public until furthernotice.• The office run by Oxfordshire countycouncil was closed to the public while police carried out forensicinvestigations.
closed mind• Mirth is one of the gifts of men for it is an opener of the closed mind.• That's the number one defence of the closed mind.• What is vital is that no employer should approachdisciplinary problems with a closed mind.• What we seek is merely evidence that Pound didn't go to Sicily with a closed mind.• Openmindedness Open up to the possibility of how closed your mind is A closed mind is a small mind!• A closed mind is when you believe that your way of making profit is superior to everyone else's.• A closed mind is when you consistently believe that you're right and the other person is wrong.• It is from closed minds that so many social evilsflow.
From Longman Business Dictionary
closedclosed /kləʊzdkloʊzd/adjectiveadj
not open for business
The markets were closed on Monday and Tuesday for the Christmas holiday.