fixed aim的用法和樣例：
例句
- Stability condition of the proportional control algorithm is given for a fixed target.
針對固定目標，文中給出了比例控制演算法的穩定性條件。 - In this paper,the method of reentry maneuver guidance applying to attack the ground fixed target is described by using flight dynamics principle and modern control theory.
本文運用飛行力學原理和現代控制理論，對攻擊地面固定目標的飛行器的再入機動制導方法進行了研究。
