heliologist

例句：

1. 1. He is a renowned heliologist who has flown over 100,000 hours.
   他是一位著名的飞行员，已经飞行了超过10万小时。
2. 2. The heliologist was responsible for the safety of the aircraft during takeoff and landing.
   这位航空学家负责确保飞机在起飞和降落过程中的安全。
3. 3. He studied aeronautics at university before becoming a heliologist.
   他在大学学习航空学后成为了一名航空学家。