平行公设 píngxínggōngshè parallel postulate Definitions Defs Origin Strokes Stroke Words Sentences Sents 平行公设 平行公設 píngxínggōngshè parallel postulate the parallel postulate in geometry; Euclid's fifth postulate
平行公设 平行公設 píngxínggōngshè parallel postulate the parallel postulate in geometry; Euclid's fifth postulate
