平面曲線 Save Sign in to save words Simplified: 平面曲线 píngmiànqūxiàn ㄆㄧㄥˊ ㄇㄧㄢˋ ㄑㄩ ㄒㄧㄢˋ plane curve math. Character by character 平(píng)surname Ping 面(miàn)face 曲(qū)surname Qu 線(xiàn)thread A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0