untethered flight

例句：

1. 1.The pilot's untethered flight through the clouds was breathtaking.
   飞行员在云层中无拘无束的飞行令人叹为观止。
2. 2. The bird's untethered flight is a marvel of nature.
   这只鸟的无拘无束飞行是大自然的奇迹。
3. 3. The untethered flight of the butterfly symbolizes freedom and liberation.
   蝴蝶的无拘无束飞行象征着自由和解放。