积分方程 Traditional 積分方程 jī fēn fāng chéng 🔊 integral equation (math.) + Keep this word Meanings jī fēn fāng chéng 積分方程 integral equation (math.) Its characters 积jīto amass; to accumulate; to store upHSK 7–9分fēnminute (past the hour)HSK 1方fāngsquareHSK 5程chéngrule