Since all forms of potassium alum are soluble in water, when the stone is wet or applied to wet skin, an invisible, fine layer of the mineral is rubbed off the stone and applied to the skins surface.
因为各种状态的钾明矾都能溶于水，当把它弄湿或接触湿皮肤时，会有一层肉眼看不见的细腻矿物层从钾明矾表面脱落，吸附到皮肤表面。
Wainwright rubbed a knuckle along the surface of his chin .
温赖特的一个手指关节在下巴上搓来搓去。
Objective: This study discusses the relation between the rubbed state of basal surface of removable denturecasting framework and oral hygene.
目的：探讨可摘局部义齿铸造支架组织面研磨状况与口腔组织健康之间的关系。
And additionally, a pencil can be gently rubbed across the surface of the paper in a manner that doesn't leave lines.
此外，铅笔还能在纸面上轻轻揉擦画出没有线的调子。
And additionally, a pencil can be gently rubbed across the surface of the paper in a manner that doesn't leave lines.
此外，铅笔还能在纸面上轻轻揉擦画出没有线的调子。
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