notion        
noun [ C or U ] uk/ˈnəʊ.ʃən/ us/ˈnoʊ.ʃən/
C1 观念;看法
a belief or idea
  [ + that ] The show's director rejects the notion that seeing violence on television has a harmful effect on children. 节目制片人们并不认为看到电视上的暴力场景会对孩子们造成不良影响。 
 I have only a vague notion of what she does for a living. 我不太清楚她靠什么谋生。 
 Synonyms: conceptconceptionconstruct idea (KNOWLEDGE)thought 
 - More examples
 - He has some fanciful notion about converting one room of his apartment into a gallery.
 - I don't think he has any notion of the seriousness of the situation.
 - Dave's got some strange notion that you're only respectable if you own a piece of property.
 - You must judge each film on its own merits, without any preconceived notions about what it's like.
 - Whatever gave you that notion?
 
  (FOR SEWING)     
notions [ plural ] US (UK haberdashery) 缝纫用品;缝纫用品店;缝纫用品部
cloth, pins, thread, etc. used for sewing, or a shop or a department of a large store that sells these
  There's a fabric store there that sells notions.
 They sell fabric but as far as I know, they don't sell notions.
 You can buy notions for patchwork and quilting.
 They carry a good range of dressmaking notions.
 I was looking online for some sewing notions.
 You'll find zippers over in Notions.
 Idiom   
have/take a notion to do somethingidiom  old-fashioned 突然想做…
to suddenly want to do something
  I had a notion to write them a letter. 我突发奇想,打算给他们写封信。