case insulation

例句：

1. 1. The insulation in the walls is causing a lot of noise.
   墙壁里的绝缘材料造成了很多噪音。
2. 2. They used insulation to prevent the pipes from freezing.
   他们使用了绝缘材料来防止管道结冰。
3. 3. The engineer used insulation to improve the building's energy efficiency.
   工程师使用了绝缘材料来提高建筑物的能源效率。