a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
silica的用法和样例：
例句
用作名词 (n.)
Silica, in fact, is a desirable impurity because it is one of the reactants. 硅石实际上是一种有用的杂质，因为它是一种反应剂。
Our company has our own silia stone moutain and silica powder producing plant. 我公司有自己的硅石矿山和硅石粉加工厂。
The government sets up new health standard for respirable silica dust in the air of workplace. 政府出台了新的工作场所空气呼吸性矽尘卫生标准。
沪公网安备 31011502000490号
电信业务许可证编号：沪B2-20190700
