覆层

例句：

1. 1. The roof ismade of asphalt shingles, providing a protective layer against the elements.
   屋顶由沥青瓦片制成，为抵御恶劣天气提供了保护层。
2. 2. The newpaint has a glossy finish that addsa layer of beauty to the surface.
   新漆的光泽表面增加了表面的美感。
3. 3. Thesoil was covered with a layer of snow, making it difficult to dig.
   土壤被一层雪覆盖，使得挖掘变得困难。