The Derivativeterm when combined with proportional action improves control by sensing changes and correcting for them quickly.
导数项与比例作用结合在一起时，通过感觉变化和修正而迅速改善了控制。
2
In many problems of mechanics and physics there frequently appears the differential equation with the derivativeterm of the highest-order containing small parameters.
在很多物理和力学的问题中常出现最高阶导数项带有小参数的微分方程。
3
The factor of the mixed partial derivativeterm controls the grid orthogonality. The other two factors of second order partial derivative terms control the grid spacing.