unperturbed orbit

例句：

1. 1. The spacecraft was traveling in an unperturbed orbit around the moon.
   宇宙飞船在月球周围以一个平静的轨道运行。
2. 2. The satellite's unperturbed orbit allowed it to observe the planet from a safe distance.
   卫星的平静轨道允许它从安全距离观察这颗行星。
3. 3. The astronauts were able to maintain their unperturbed orbit for several weeks without any incidents.
   宇航员们能够维持他们的平静轨道，几周内没有任何事故。