突变理论 Traditional 突變理論 tū biàn lǐ lùn 🔊 catastrophe theory + Keep this word Meanings tū biàn lǐ lùn 突變理論 (math.) catastrophe theory Its characters 突tūto dash变biànto changeHSK 3理lǐtextureHSK 6论lùnopinion