section iron chassis

例句：

1. 1. The bookis divided into three sections.
   这本书分为三个部分。
2. 2. The engineer designed a new section forthe bridge.
   工程师为桥梁设计了一个新的部分。
3. 3. The team was divided into two sectionsto work on different projects.
   团队被分成两个部分来处理不同的项目。