roof cross beam

例句：

1. 1. The old house has a beautiful roof made of wood.
   这所旧房子有一个用木头做的漂亮的屋顶。
2. 2. The roof of the house was leaking and needed repair.
   这所房子的屋顶漏水，需要修理。
3. 3. The roof of the car is designed to withstand heavy rain.
   汽车的屋顶设计成能承受大雨的重量。