第一近似 meaning in English

first approximation

Criteria for the nonlinear dynamic stability of rotative vehicles are derived by the liapunov ' s first method and the routh - hurwitz stability criterion , this criteria can be applied to the dynamic stability analysis of controlled rotative missiles , projectiles and rockets
应用李亚普诺夫第一近似理论和劳斯霍尔维茨方法导出了旋转飞行器的非线性运动稳定性判据，这个判据可应用于有控旋转导弹的运动稳定性分析，也可应用到炮弹和火箭弹上。