医生采取了迅速行动挽救病人的生命。

The doctor took ___swift action to save the patient's life.

那只燕子以惊人的速度掠过天空。

The ___swift swallow darted across the sky at incredible speed.

我看见一只雨燕在树梢间快速穿梭。

I saw a ___swift darting swiftly among the treetops.