难上难 難上難

    nánshàngnán

    1. Adjectiveextremely difficult; even more difficult

    这道数学题难上难,连老师都觉得很有挑战。Zhè dào shùxué tí nánshàngnán, lián lǎoshī dōu juéde hěn yǒu tiǎozhàn.The math problem is so difficult that even the teacher finds it challenging.