“鳍”造句

海豹的鳍肢与人类的手臂同源。
The seal's flipper is homologous with the human arm.

我们可以看到鱼把鳍露出水面.
Fish could be sighted finning near the surface.

鲸、海豹, 企鹅和海龟均有鳍形肢.
Whales, seals, penguins, and turtles have flippers.