One company selling hydrochloric acid for etching cement floors reckoned that, because it was in gel form and could legally be washed down the drain, the product was environmentally friendly.
一家销售蚀刻水泥地盐酸的公司以为盐酸为胶液产品，可以被合法地冲进下水道，因此是环保产品。
2
Acidetching result shows that the crystal has regional single domain structure.
酸腐蚀结果表明，晶体具有区域性单畴结构。
3
Specimens prepared by polishing and etching in a weak solution of nitric acid and alcohol reveal the lamellar structure of alternating plates that forms on slow cooling.