upstand beam

例句：

1. 1. The engineer carefully measured the dimensions of the upstand beam before installing it.
   工程师在安装之前仔细测量了立杆的尺寸。
2. 2.The construction crew used a special tool to install the upstand beams in the new building.
   建筑工人使用特殊工具在新建的建筑物中安装了立杆。
3. 3. The upstand beams were essential for supporting the weight of the roof and preventing it from collapsing.
   立杆对于支撑屋顶的重量并防止其坍塌至关重要。