heli-

例句：

1. 1. The pilot was able to land the heli- in a remote area.
   飞行员能够将直升机降落在偏远地区。
2. 2. Heli-s are often used for emergency medical missions.
   直升机常用于紧急医疗任务。
3. 3. The heli- was seen flying over the city during the day.
   直升机在白天被看到飞越城市上空。