1)multiplying factor,倍数因子2)factor,系数，[倍]率，因子，因数，因素3)ecological efficiency restraint,倍数因子约束4)double factorial function,双倍因子函数5)Enzyme Amoun t Multiple Factor,酶量倍数因子6)Common factors and multiples,公因子及公倍数
用法和例句
Based on elementary number theory to study Smarandache double factorial function,two important results are inducted,which plays an important role in the progressing of elementary number theory.