所有的动物都需要氧气才能生存,动物通过呼吸得到氧气,有的吸进空气中的氧气,有的吸进水中的氧气。两栖动物两者都可以做到。成年青蛙不仅能用肺呼吸,还能通过皮肤呼吸。它们的皮肤不同于其它动物,很薄,摸起来又光滑又湿润。 All animals need oxygen to survive, animals get oxygen through breathing, some inhale into the air of oxygen, and some inhaled into the water of oxygen. Amphibians can do both. Adult frogs not only breathe in the lungs, but also breathe through the skin. Their skin is different from other animals, thin, feel smooth and moist.