Eutheria

例句：

1. 1.Eutherianism is the belief that all animals are descended from a common ancestor.
   欧特里亚主义是认为所有动物都来自共同祖先的信念。
2. 2.The discovery of Eutherian mammals in the fossil record has challenged our understanding of evolution.
   在化石记录中发现的欧特里亚哺乳动物挑战了我们对进化的理解。
3. 3.Eutherian mammals are characterized by their warm-blooded nature and large brain size.
   欧特里亚哺乳动物以其温血特性和较大的大脑大小而著称。