在我们可获得的100种元素中，约四分之三可归入金属，而这其中约二分之一至少具有某种工业或商业用途。
Of the 100 elements available to us, about three-quarters can be classified as metals. And, about half of these are of at least some industrial or commercial use.
磷在化合物中的原子价为3或5，工业用途很多。
Phosphorus has valence 3 or 5 in compounds, which have many USES in industry.
本文主要介绍了丙烯酰胺在石油工业中“三次采油”的用途。
The paper mainly introduces the use of acrylamide in the petroleum industry to enhanced oil recovery (EOR).
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