overlayer

例句：

1. 1.The roof of the house is made of wood and has a layer of asphalt shingles for insulation.
   这座房子的屋顶是用木头做的，上面铺了一层沥青瓦作为隔热层。
2. 2.The engineer used an overlayer to reinforce the concrete slab.
   工程师用一种覆盖物加固了混凝土板。
3. 3.The new design uses a lighter material for the overlayer, which reduces weight and saves energy.
   新设计中使用了一种更轻的材料作为覆盖物，这减轻了重量并节省了能源。