毛颚类动物

例句：

1. 1. The dinosaurs were the first mammals towalk on land.
   恐龙是第一批在陆地上行走的哺乳动物。
2. 2. Thescientists discovered a new speciesof fish in the ocean.
   科学家们在海洋中发现了一种新的鱼类。
3. 3. Theresearchers found that the ancient animals had adaptedto their environment.
   研究人员发现古代动物已经适应了他们的环境。