section of a finite group

例句：

1. 1. The book is divided into several sections.
   这本书被分成了几个部分。
2. 2.The team was divided into two sections for the game.
   队伍被分成了两个部分参加比赛。
3. 3.The teacher explained the material in sections to make it easier to understand.
   老师将材料分成几个部分来解释，以便更容易理解。