... 他们的学校位于山脚下脚下。 » Their school is located in the foothills at the foot. 打磨的痕迹 » Traces of grinding 项目名称： » Project name: ...
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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.
介绍中明明说，石头是手工打磨的，可稍微检查就很容易发现，石头上面留有很多工厂机器的痕迹。
It clearly states that the stone was hand-made but upon inspection one could easily discern many markings from factory machinery.
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