functional layer

例句：

1. 1. The functional layer of thebuilding is made up of steel beamsand columns.
   这座建筑的功能层由钢梁和柱组成。
2. 2. The functional layer ofthe software is responsible for handling user input.
   软件的功能层负责处理用户输入。
3. 3. Thefunctional layer of the system is designed tooptimize performance.
   系统的功能性层旨在优化性能。