ridge pole

例句：

1. 1. The ridge poles are holding up the roof of the house.
   山脊杆支撑着房子的屋顶。
2. 2.The ridge poles were used to support the weight of the roof.
   山脊杆用于支撑屋顶的重量。
3. 3. The ridge poles were replaced after a storm damaged them.
   暴风雨后，山脊杆被更换了。