roofing granules

例句：

1. 1.The roofing company installed the new tiles on the house.
   这家屋顶公司给房子安装了新的瓦片。
2. 2.The roofing granules are made from recycled materials.
   这些屋顶颗粒是由回收材料制成的。
3. 3. Roofing granules are essential for waterproofing the roof.
   屋顶颗粒对于防水屋顶至关重要。