母体

例句：

1. 1. The mother bear is protecting her cubs from the dangers of the forest.
   母熊正在保护她的幼崽免受森林的危险。
2. 2. The study of genetics involves understanding how genes are passed down from one generation to the next.
   遗传学研究涉及理解基因是如何从一代传到下一代的。
3. 3. In the early days of human evolution, the mother was considered the center of family life.
   在人类早期进化时期，母亲被视为家庭生活的中心。