orbit closure

例句：

1. 1.The satellite orbited the Earth once before it was closed.
   卫星在绕地球运行一次后被关闭。
2. 2.The spacecraft's orbit closure was due to a technical issue.
   宇宙飞船的轨道闭合是由于技术问题导致的。
3. 3.The team successfully completed their mission, but the orbit closure was unexpectedly delayed.
   团队成功完成了任务，但轨道闭合意外地被推迟了。