affair  
noun [ C ] uk/əˈfeər/ us/əˈfer/
  (MATTER)         
 B2 事务;事情
a situation or subject that is being dealt with or considered
  She organizes her financial affairs very efficiently. 她把自己的财务处理得井井有条、又快又好。 
 He's always meddling in (= trying to influence) other people's affairs. 他总想插手别人的事情。 
 What I do in my spare time is my affair (= only involves me). 我在业余时间做什么,这是我自己的事。 
 B2 (通常指在道德上被谴责的)事件
a matter or situation that causes strong public feeling, usually of moral disapproval
  The arms-dealing affair has severely damaged the reputation of the government. 武器交易事件严重损害了政府的声誉。 
 The president's handling of the affair has been criticized. 总统对这一事件的处理遭到了抨击。 
 - More examples
 - The whole affair does not reflect well on the government.
 - As a leader, he's been criticized for his inexperience in foreign affairs.
 - He put his affairs in order before he went into hospital.
 - I've never been very money-minded - I leave all my business affairs to my financial adviser.
 - The director has come in for a lot of criticism over his handling of the affair.
 
  (RELATIONSHIP)      
 B2 (尤指秘密的)性关系;私通;风流韵事
a sexual relationship, especially a secret one
  She's having an affair with a married man. 她和一个有妇之夫私通。 
 The book doesn't make any mention of his love affairs. 这本书没有提及他的种种风流韵事。 
 an extramarital affair 婚外恋 
 - More examples
 - She discovered (that) her husband was having an affair.
 - They have been rather indiscreet about their affair.
 - It's an open secret around the office that they're having an affair.
 - Their love affair began against a backdrop of war.
 - She hired a private detective to find out if her husband was having an affair.
 
  (EVENT)      
  活动,经历
an event
  The party turned out to be a quiet affair. 结果聚会办得冷冷清清。 
   (THING)      
 old-fashioned(某类的)东西 
an object of the type stated
  She wore a long black velvet affair. 她身穿一件那种黑色天鹅绒的长裙。