绵里藏针 (綿裡藏針) mián lǐ cáng zhēn
          
              mián lǐ cáng zhēn 
              
              set phrase 
              a needle concealed in silk floss; ruthless character behind a gentle appearance; a wolf in sheep's clothing 
              Domain: Idiom 成语
              
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                Notes: (CC-CEDICT '綿裡藏針')