短語(yǔ)詞組短語(yǔ)Second -order equation [數(shù)]二階方程;翻譯nonlinear second -order equation 非線性二階方程pseudo -second-order equation 假二級(jí)方程式second order difference equation 二階差分方程second order differential equation 二階微分方程second order differetial equation 二階微分方程second order evolution equation 二階發(fā)展方程second order elliptic equation 二階橢圓方程 返回 second order equation