During the course of polishing, there is always a best pressure point between workpieces and sand belt for the life of sand belt and the polishing efficiency.

Five years later they are still bringing up dry sand, scratching out their fate as a microcosm of life on this planet.

If we can figure out happiness from the plain life, or we can enjoy the leisure from daily housework, we will see a world in a grand of sand, and achieve a new height in our life.