porpoise

the boat began to porpoise badly.

那只船开始厉害地颠簸。

the common porpoise of the North Atlantic and Pacific.

产于北大西平水域中普通的鼠海

As the turtle swims across the oceanarium,the first porpoise swoops down from above and butts his shell with his belly.

在另一次游戏中，当海龟游过水族馆时，第一只海从上方猛扑下去，并用腹部撞击龟壳。