F layer

例句：

1. 1.The structure of the building is dividedinto several F layers.
   这座建筑的结构被分成了几个层次。
2. 2. The data was analyzed inthree different F layers.
   数据被分析在三个不同的层次上。
3. 3. The team worked oneach F layer separately.
   团队分别独立地工作在每个层次上。