rounded sand grain 圆形砂粒 ; 倒角 ; 去角
The dune sands are very well sorted and rounded pure quartz sand(>95%) with single mode grain distribution and without suspension materials.
沙丘砂由分选、磨圆好的石英砂组成，含量大于95%，具单众数粒度分布，无悬移质。
And sand can in workpiece surface junction with small rounded corners, make artifacts appear more beautiful, more precise.
并且喷砂能在工件表面交界处打出很小的圆角，使工件显得更加美观、更加精密。
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