蚍蜉撼大树 (蚍蜉撼大樹) pífú hàn dàshù
          
              pífú hàn dàshù 
              
              phrase 
              an ant trying to shake a big tree; to overrate one's own strength 
              Domain: Proverb 谚语
              
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                Notes: Also written 蚍蜉撼树 (CC-CEDICT '蚍蜉撼大樹')