多级的分离过程基本上是石油的全身心，石化，以及化学工业。
Multistage separation processes are essentially the heart and soul of the petroleum, petrochemical, and chemical industries.
化学工业所需要的原料配方有误，就会危及到我们周围的环境以及人类的健康。
The chemical industry relies on many ingredients that in the wrong place are harmful to the environment, human health or both.
还有一个大型化学工业，生产农用化学品和杀虫剂以及药品。
There is also a large chemical industry, producing agricultural chemicals and insecticides as well as pharmaceuticals.
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