untreated surface

例句：

1. 1.The engineer inspected the untreated surface of the building for any signs of damage.
   工程师检查了建筑物未处理表面的任何损坏迹象。
2. 2.The company is committed to providing untreated surface materials for its products.
   该公司致力于为其产品提供未经处理的表面材料。
3. 3.The new paint job on the car's untreated surface looks amazing.
   汽车新漆的未经处理表面看起来非常棒。