Tetrapteran

例句：

1. 1. The dinosaurs were a type of tetrapod.
   恐龙是一种四足动物。
2. 2. Many amphibians are tetrapods that live in water.
   许多两栖动物是生活在水里的四足动物。
3. 3. The fossilized footprints of a prehistoric reptile were discovered on the beach.
   在海滩上发现了一种史前爬行动物的化石足迹。