直接推导 meaning in Chinese

direct derivation

A method for deriving the perturbation equation
直接推导摄动运动方程的一种方法
Using the vector potential , the expression for calculating inductance of air - cored solenoid coil is derived in the dissertation . and the calculating methods of function t in the calculating expression are given for the convenience of the calculation of inductance while the precision is not strictly requested
利用矢量磁位a直接推导出了通电空心圆柱线圈电感的计算表达式，给出了求解计算式中函数t的计算方法，以方便精度要求不高时的电感计算。