翻译:变分方程组 同义词1)Variational equation system,变分方程组2)time-varying differential equation system,时变微分方程组3)composition equation,组分方程4)differential equation groups of variable linear constant index,变系数线性微分方程组5)changeable coefficient differential equation group,变系数微分方程组6)system of variable (ordinary) coefficient differential equations,变(常)系数微分方程组