Four different chemical reactions dominate the industry-each of which has pros and cons when it comes to utility, durability, cost, safety and performance.

四种不同的化学反应主导了工业界——当考虑到效用、耐用性、成本、安全性和性能时，它们中的每一种都有优劣之分。

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Polypropylene fiber is a kind of all kinds of fiber materials, with its perfect chemical stability and excellent technical and economic performance, is widely used in cement based composite materials.

聚丙烯纤维作为各种纤维材料中的一种，以其极好的化学稳定性和优良的技术经济性能，在水泥基复合材料中得到日益广泛的应用。

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A chemical or fluid that alters the performance of an engineered slurry or treatment fluid.

改变水泥浆或处理液的设计性能的一种化学剂或流体。

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Weakness in the performance chemical unit had to do with weak market demand across the globe.

FORBES: DuPont And A Hungry World Offset Chemicals Weakness; Dividend Hiked, Outlook Reaffirmed

Dr Miah says that physical and performance enhancement, be it chemical or technological, is now widely accepted in society and we should rethink how we define what's banned in sport and what's allowed.

BBC: Testing times: Injecting reality into the war on doping

I've always been against any chemical method of enhancing performance.

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