filling layer

例句：

1. 1. The engineer designed a filling layer to improve the durability of the roof.
   工程师设计了一个填充层来提高屋顶的耐用性。
2. 2. The car's body is made of a lightweight but strong material, with a filling layer for added protection.
   这辆车的车体是由轻质但坚固的材料制成的，有一个填充层以增加额外的保护。
3. 3. In the construction industry, the use of foam as a filling layer can significantly reduce weight and increase strength.
   在建筑行业中，使用泡沫作为填充层可以显著减轻重量并增加强度。