表面粗糙度是机械加工中的重要概念，它直接影响到机加工表面的机械性能，因此表面粗糙度的测量与评定一直是机械行业的研究课题。
Surface roughness is an important concept in machining and determines the performance of machining surface. Therefore, surface roughness measurement is a important task of machine-building industry.
表面粗糙度是机械加工中的重要概念，它直接影响到机加工表面的机械性能，因此表面粗糙度的测量与评定一直是机械行业的研究课题。
Surface roughness is an important concept in machining and determines the performance of machining surface. Therefore, surface roughness measurement is a important task of machine-building industry.
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