automatic footers

例句：

1. 1. The automatic footers are designed to prevent slipping on wet surfaces.
   自动底部支撑设计用来防止在湿滑表面上滑动。
2. 2. In this project, we need to consider the automatic footers for the new building.
   在这个项目中，我们需要考虑到新建筑的自动底部支撑。
3. 3. The engineers were able to install the automatic footers without any issues.
   工程师们能够顺利地安装自动底部支撑，没有任何问题。