mounting column

例句：

1. 1. The engineers carefully mounted the column on the roof.
   工程师们小心翼翼地将柱子安装在屋顶上。
2. 2. The construction workers had to mount the column before starting work.
   建筑工人在开始工作之前必须安装好柱子。
3. 3. The column was used as a support for the roof structure during the installation process.
   该柱子作为屋顶结构的支撑，在安装过程中被使用。