reference  
noun uk/ˈref.ər.əns/ us/ˈref.ɚ.əns/
  (MENTION)      
 B2 [ C or U ]提到;谈到;论及 
a mention of something
  Knowing what had happened, I avoided making any reference to (= mentioning) weddings. 因为我知道发生了什么,所以就避开不谈婚礼的事儿。 
formal I am writing with/in reference to (= in connection with) your letter of 15 March. 现就3月15日贵函致复。 
 - More examples
 - She made a veiled reference to her former employer.
 - He made several references to his time in France.
 - I am writing to you with reference to the job advertised in yesterday's newspaper.
 - He spoke at length without once making reference to the current crisis.
 - She spoke in very vague terms and there were no direct references to specific situations.
 
  (IN A PIECE OF WRITING)        
 B2 [ C ]引文出处;参考书目 
a writer or a book, article, etc. that is mentioned in a piece of writing, showing you where particular information was found
  [ C ] (abbreviation ref)(商务信函中为方便查询所用的)标识,编号,标记 
in a business letter, a number that tells you who to speak to or where to look for more information
  In all future letters on this subject, please use/quote our reference JW/155/C. 今后有关此事项的所有信件都请标明我方编号JW/155/C。 
 - More examples
 - You need to make a list of all your references.
 - There was a long list of references at the end of the article.
 - Where are your references?
 
  (LETTER)      
 B2 [ C ]推荐信;介绍信 
a letter that is written by someone who knows you, to describe you and say if you are suitable for a job, course, etc.
  My old headteacher said he would write/give me a glowing (= very good) reference. 我以前的中学校长说他会为我写一封很好的推荐信。 
 - More examples
 - We need a reference from your former employer.
 - I like to keep in with my ex-employer, you never know when you might need a reference.
 - We should really have taken up her references.
 - I'm often asked to provide references for ex-employees.
 - She provided a written reference from a previous employer.
 
  (LOOK AT)      
C1 [ U ]参考,查阅 
a quick look at a book, piece of paper, etc. in order to find information and help
  He made the whole speech without reference to the notes in front of him. 他整场演讲完全没有参考自己面前的笔记。