RMS roughness

例句：

1. 1. The surface of the rock is very rough, making it difficult to drill.
   岩石的表面非常粗糙，难以钻孔。
2. 2.The car has a rough ride, but it's comfortable for long trips.
   这辆车的驾驶体验颠簸，但对于长途旅行来说很舒适。
3. 3. The engineer measured the roughness of the surface with a laser microscope.
   工程师用激光显微镜测量了表面粗糙度。