polyclad

例句：

1. 1. The polyclad roof provides excellent insulation against the cold winter months.
   多层覆盖的屋顶在寒冷的冬季提供了极好的隔热效果。
2. 2. The engineer designed a polyclad structure to withstand extreme weather conditions.
   工程师设计了一种多层结构，以承受极端天气条件。
3. 3. The polyclad walls are resistant to fire and provide a safe environment for the occupants.
   多层墙壁防火且为居住者提供了一个安全的环境。