mammality

例句：

1. 1. Mammals are the only animals that give birth to live young.
   哺乳动物是唯一能够产下活生生幼崽的动物。
2. 2. The baby elephant is a mammal and needs to be fed milk.
   这个小象是哺乳动物，需要喝奶。
3. 3. Mammals have fur, feathers, or scales as their body coverings.
   哺乳动物有毛、羽毛或鳞片作为它们的体表覆盖物。