疑难问题 Traditional 疑難問題 yí nán wèn tí 🔊 knotty problem + Keep this word Meanings yí nán wèn tí 疑難問題 knotty problemintractable difficulty Its characters 疑yíto doubt; to suspect难nándifficult (to...)HSK 3问wènto askHSK 1题títopicHSK 2