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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 平行公設 [ㄆㄧㄥˊ ㄒㄧㄥˊ ㄍㄨㄥ ㄕㄜˋ; ping2 xing2 gong1 she4]
 the parallel postulate (geometry)
 Euclid's fifth postulate