vt.[W]
    
      - (不用被動式)關於
 
      - 涉及,關係到;影響到
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The letter is chiefly 
concerned with export commodities.
這封信主要是關於出口商品的。
The news 
concerns your brother.
這消息與你兄弟有關。
 
      - 使擔心;使不安[H][(+about/for)]
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The boy's poor health 
concerned his parents.
那男孩健康狀況不佳,使他的父母親憂慮。
He is 
concerned for her safety.
他擔心她的安全。
 
      - 使關心[H][(+about/with)]
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He was very 
concerned about her.
他對她非常關心。
 
    
    n.
    
      - 關心的事,重要的事[C]
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That's no 
concern of mine.
那不關我的事。
 
      - 關係;利害關係[C][U][(+with/in)]
 
      - 擔心,掛念;關懷[U][C][(+about/for)]
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Andrew expressed his 
concern.
安德魯表示了他的關切。
 
      - 公司,企業[C]
 
      - 【口】小玩意兒;東西
 
    
   
  片語
  
    concern oneself with/about/over
    
      - 關心
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A good doctor should always 
concern himself with the health of his patients.
一位好醫生應時刻關心病人的健康。
 
    
    of concern
    
      - 重要的
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It's a matter 
of concern.
這件事至關重要。
 
    
    as/so far as ... be concerned
    
      - 就……而言
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As far as I'm concerned, he can do whatever he likes.
就我而言,他可以喜歡什麼就做什麼。
  
    
    to whom it may concern
    
      - (用作正式信件的開頭)敬啟者
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You should begin a formal letter with "
To whom it may concern. "
正式信件的開頭你應寫"敬啟者"。
 
    
    have a concern in
    
      - 在……中有利害關係;在……中有一份
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He 
had a concern in the business.
他是這個企業的股東。
 
    
    have no concern with
    
      - 與……無關
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I 
have no concern with the matter.
我與那事無關。
 
    
   
  辨析
  
 
  v.
   - relate to; be about. 
▸affect or involve.
 - worry (someone).
 - 
(be concerned with/to do something)
 regard it as important to do something.
 
n.
   - worry; anxiety.
 - a matter of interest or importance.
 - a business.
 
 
  Phrase
  
    - as 
(or so)
 far as someone/thing is concerned
 as regards the interests or case of someone or something.  - have no concern with
 have nothing to do with.  - to whom it may concern
 used to address a reader whose identity is unknown. 
   
  Etymology
  ME: from Fr. concerner or late L. concernere (in med. L. ‘be relevant to’), from con- (expressing intensive force) + cernere ‘sift, discern’.