不可约分数 bùkěyuēfēnshù irreducible fraction Origin Definitions Defs Strokes Stroke Words Sentences Sents 不可 bùkě auxiliaryadjective cannot to be unable to; to be impossible约 約 yuē to reduce a fraction To reduce a fraction by a common factor.分数 分數 fēnshù noun fraction A numerical quantity that is not a whole number, representing one or more parts of a unit