You can tell if an animal is a reptile instead of an amphibian if it has dry, scaly skin.

你能判断出如果一种动物是爬行类而不是两栖类，它会有干燥、有鳞片的皮肤。

They breathe through lungs and have dry scaly skins. Reptiles which live in water come to the water surface to breathe.

它们通过肺部和干的有鳞片的皮肤来呼吸。生活在水中的爬行动物会到水面上呼吸空气。