微分
(math.) differential (of a function); differential (equation etc); to differentiate; differentiation
微分几何
differential geometry
微分几何学
differential geometry
微分方程
differential equation (math.)
偏微分方程
partial differential equation (PDE)
常微分方程
ordinary differential equation (ODE)
泾渭分明
as rivers Jing and Wei separate clearly (idiom); to be entirely different
臀位分娩
breech delivery (medicine)