polished surface; ground surface
Technical term for a surface that has been polished or ground, used in engineering, manufacturing, and materials science.
Measure the roughness of the polished surface.
The ground surface of this part is as smooth as a mirror.
表面 is a general term for any surface, whereas 研磨面 specifically denotes a surface that has been polished or ground.
Compound of 研磨 (polishing, grinding) and 面 (surface).