Calcium carbonate is a very common nonmetal material that exists in nature widely, and is a traditional inorganic salt product of chemical industry.
碳酸钙是自然界广泛存在的一种很普通的非金属材料，也是一种传统的无机盐化工产品。
Ferrous sulphate is a wide used product of chemical industry, which was produced with waste iron as raw material in the past so that its cost was higher.
硫酸亚铁是一种用途广泛的化工产品，过去系采用废铁作原料进行生产，但成本较高。
Indole, which is an important raw organic material and fine chemical product, has many USES in the fields of industry, agriculture and medicine.
吲哚作为一种重要的有机原料和精细化工产品，在工业、农业和医药等领域中用途非常广泛。
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