category of Abelian groups

例句：

1. 1.The Abelian group is a type of group that has no central authority.
   阿贝尔群是一种没有中心权威的群体。
2. 2.The Abelian group theory is a theory about the structure of groups.
   阿贝尔群论是关于群的结构的理论。
3. 3.The Abelian group is a type of group that has no central authority.
   阿贝尔群是一种没有中心权威的群体。