追根问底 (追根問底) zhuīgēn wèn dǐ
          
              zhuīgēn wèn dǐ 
              
              set phrase 
              to examine roots and inquire at the base; to get to the bottom of sth 
              Domain: Idiom 成语
              
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                Notes: (CC-CEDICT '追根問底')