Reply: retread stone, it means use different grain of diamond polish pad and water to polish the stone again.

• 答：所谓石材翻新研磨是利用不同粗细之金刚石研磨片，加水将旧石重新磨亮，无缝研磨处理是舍弃传统水泥填缝材料，并使之饱和树脂胶。