这使得几乎任何厚度的玻璃都可以不间断地制造出来，但是滚轴会在玻璃两面留下痕迹，这些玻璃之后就需要打磨和抛光。
This allowed glass of virtually any thickness to be made non-stop, but the rollers would leave both sides of the glass marked, and these would then need to be ground and polished.
需要将地面内的沙石打磨到无法通过肉眼看到颗粒的痕迹。
You need to sand grinding into the ground inside the particles can not be seen by the naked eye marks.
轻轻打磨清除粘纸和铅笔的痕迹。
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