Terms containing backward-differentiation formula

Subject	English	Chinese
oil	backward differentiation formula	后向差分公式
earth.sc.	backward differentiation formulas	后向差分式
el.	backward-differentiation formula	反向求微分方程
el.	second-order backward-differentiation formula	二阶反向求微分方程
el.	trapezoidal rule/backward-differentiation formula	梯形法则反向求微分方程