微积分学:Calculus微分:Differential积分:Integral导数:Derivative一阶导数:the first derivative二阶导数:the second derivative区间:interval开区间:open interval闭区间:closed interval切线:tangent斜率:slopef(x)在区间(a,b)的积分:integrate f(x) on open interval (a,b)/ integrate f(x) from a to b微分方程:differential equation常微分方程:ordinary differential equation偏微分方程:partial differential equation