pillar-bolt

例句：

1. 1. The pillar-bolt holds the roof together.
   支柱螺栓将屋顶连接在一起。
2. 2. The pillar-bolt was used to fasten the door shut.
   支柱螺栓被用来固定门关闭。
3. 3. The pillar-bolt was removed to replace the broken one.
   为了更换断裂的支柱螺栓，移除了它。