common swifts 雨燕
swift action 迅速行动
fast swifts 快速移动的事物
A: Look! Are those swifts over the lake?
A：看！湖面上那些是雨燕吗？
B: Yes, they are swifts, and they are flying very fast.
B：是的，它们是雨燕，飞得非常快。
1) 一种小型鸟类（雨燕）的复数形式
2) 快速移动或敏捷之物的复数形式
1. 雨燕
noun
1. Plural of swift: small birds with long, pointed wings that fly very fast.