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....
The lower bleeder is made from fused silica, and aluminum carbon and zirconium materials.下分水口均可采用熔融石英 、 铝碳质、锆质材料制成.Two molten steel outlets are positioned at two narrow side wall the lower the lower bleeder.两个钢液出水口处于下分水口...