双套牙哺乳动物

例句：

1. 1. Many species of mammals are found in the forest.
   许多物种的哺乳动物在森林中被发现。
2. 2.The amphibian is a type of animal that can live both on land and in water.
   两栖动物是一种可以在陆地和水中生活的动物类型。
3. 3. Mammals are warm-blooded animals that give birth to live young.
   哺乳动物是温血动物，可以产下活体幼崽。