没有动词形式
复数 swifts，比较级 swifter，最高级 swiftest
The swift action was taken by the police.
警方迅速采取了行动。
2
The swift population in this area has declined sharply in recent years.
这个地区的雨燕数量近年急剧减少。
3
The young man swift entered the room upstairs.
这个年轻人快速地进入了楼上的房间。
