porpoise

鼠海豚、海豚

A group of porpoises followed the boat for several kilometers.

一群鼠海豚跟著船游了好几公里。

上下起伏、颠跃

The speedboat porpoised across the choppy water toward the harbor.

快艇在浪涛中上下起伏，朝港口驶去。