平面曲线 Traditional 平面曲線 píng miàn qū xiàn 🔊 plane curve + Review this word Meanings píng miàn qū xiàn 平面曲線 (math.) plane curve Its characters 平píngflat; level; smoothHSK 5面miànfaceHSK 2曲qūbentHSK 6线xiànthreadHSK 6