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smarty-pants [] 
 n .  自以为是的家伙,自作聪明的人(好像他/她无所不知)
 
Function: noun [noncount]

(来源：英语分类信息 http://fl.englishcn.com)


 
Status: informal
 
Meaning:
: a person who acts like he or she knows everything
Examples:
<Go ahead, smarty-pants, tell us about your grade-point average.>
<Don't be such a smarty-pants. [=know-it-all]>