trajectory of electron motion

例句：

1. 1. The trajectoryof the spacecraft is determined by itsinitial velocity and the gravitationalpull of the planets.
   宇宙飞船的轨迹由其初始速度和行星的引力决定。
2. 2. The trajectory of the projectileis a straight line from the launch pointto the target.
   弹道是发射点到目标点的直线。
3. 3. The trajectory of thesatellite is carefully planned to ensure it reachesits destination safely.
   卫星的轨道被精心规划，以确保安全到达目的地。