under-purlin insulation

例句：

1. 1. The engineer used a special under-purlin insulation to reinforce the beam.
   工程师使用一种特殊的下纵梁绝缘来加固梁。
2. 2.The under-purlin insulation was designed to prevent moisture from seeping through the floor.
   下纵梁绝缘设计用来防止水分渗透到地板上。
3. 3. The under-purlin insulation is crucial for maintaining the structural integrity of the building.
   下纵梁绝缘对于保持建筑物的结构完整性至关重要。