平行公设 Traditional 平行公設 píng xíng gōng shè 🔊 the parallel postulate (Euclid's fifth… + Keep this word Meanings píng xíng gōng shè 平行公設 (geometry) the parallel postulate (Euclid's fifth postulate) Its characters 平píngflat; level; smoothHSK 5行xíngto walk; to go; to travelHSK 3公gōngpublicHSK 6设shèto set up; to put in placeHSK 7–9