rapid

迅速的、快速的、急速的

The city has seen rapid growth over the past decade.

这座城市在过去十年间快速成长。

急促的

Her breathing was rapid and shallow after the climb.

爬上来之后，她的呼吸又急又浅。

急流、湍流常用复数

We rode a raft down the rapids on the river.

我们坐著橡皮艇顺著河上的急流而下。