燕子是一种快速飞行的鸟类，能够轻松捕捉昆虫。

Swallows are ___fast-flying birds that can easily catch insects.

这种新型战斗机速度极快，能够在空中进行高速机动。

The new fighter jet is ___fast-flying, capable of high-speed maneuvers in the sky.