On the basis of the model, we found ways to release the primary shaft vibration's influence on the quality of the polish surface.

在理论分析的基础上，提出减轻由主轴的振动引起的抛光表面质量问题的方法。

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Surface Polishing: Seeking smooth surfaces, artisans polish articles three times with grit or charcoal. The work requires extreme care.

表面抛光：寻求表面光滑，工匠波兰文章三倍的砂砾或木炭。这项工作需要格外小心。

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Aluminum Oxide Specific gravity 2.4 Moh hardness 3. More a filler than an abrasive. Tends to fade, but has good wear resistance. Will polish the opposing surface.

氢氧化铝比重2.4莫氏硬度3。比磨料加得更多的填充物。有衰退趋势，但耐磨性好。将抛光对偶。

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With another dab of polish I set to work wiping the entire surface, right up to the curves of the frame.

NEWYORKER: Miracle Polish

Though that also makes it more flexible (and makes the ability to grind and polish the glass to create a light-capturing parabolic surface without actually breaking the thing all the more impressive), this flexibility can be exploited to keep the reflective surface in shape.

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