The natural abrasive has special effect and superior performance than artificialabrasive in some field.
天然磨料有其独特的作用，在某些加工领域，天然磨料甚至具有比人造磨料更优越的性能。
2
Abrasives source of their raw materials, there are two kinds of natural abrasive and artificial abrasives.
磨具按其原料来源分，有天然磨具和人造磨具两类。
3
Natural or artificialabrasive powder or grain, on a base of textile material, of paper, of paperboard or of other materials, whether or not cut to shape or sewn or otherwise made up.