roof rafter

例句：

1. 1.The roof rafter is the main support for the roof.
   屋顶梁是屋顶的主要支撑。
2. 2.The builders had to reinforce the roof rafter to withstand the heavy rain.
   建筑工人不得不加固屋顶梁以承受大雨的压力。
3. 3. The old house still has its original roof rafter, which is quite rare in modern architecture.
   这座老房子仍然保留着原始的屋顶梁，在现代建筑中相当罕见。