短語詞組短語difference Network equation 差分方程difference e equation model 差分方程模型ordinary difference differential equation [數(shù)]常差分微分方程difference integration equation 差分積分方程difference e equation 差分方程difference growth equation 差分增長(zhǎng)方程difference differential equation [數(shù)]差分微分方程mixed type difference differential equation 混郃型差分微分方程 返回 difference equation