pillar ladder

例句：

1. 1. The pillar ladder is a popular tool for building and construction.
   支柱梯是建筑和施工中常用的工具。
2. 2. The engineer used the pillar ladder to climb up to the roof.
   工程师使用支柱梯爬到屋顶。
3. 3.The pillar ladder was essential for the workers to reach high places safely.
   支柱梯对于工人安全到达高处至关重要。