It is impossible that the surface gained by any machining is perfectly slippery. There is some microcosmic error of geometrical shape on the surface.
任何机械加工所得的表面，实际上不可能是理想的光滑表面，总是存在一定的微观几何形状误差。
It is impossible that the surface gained by any machining is perfectly slippery. There is some microcosmic error of geometrical shape on the surface.
任何机械加工所得的表面，实际上不可能是理想的光滑表面，总是存在一定的微观几何形状误差。
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