tetrapod wall

例句：

1. 1. The dinosaurs were the first known tetrapods.
   恐龙是已知的第一种四足动物。
2. 2. The discovery of new species of tetrapods has sparked a lot of excitement.
   新物种四足动物的发现引发了很多兴奋。
3. 3. Many scientists believe that tetrapods are the ancestors of modern mammals.
   许多科学家认为四足动物是现代哺乳动物的祖先。