当2008年金融危机来袭，从颜料到塑料袋，各种用途的基础化学制品需求量都骤然下降。
When economic crisis hit in 2008, demand for the basic chemicals used in everything from paints to plastic bags plummeted.
不过，从石油生产化学制品的主要目的在于，生产出大量具有明确界定的化合物，以奠定石化工业的基础。
Nevertheless, the main objective in producing chemicals from petroleum is the formation of a variety of well-defined chemical compounds that are the basis of the petrochemical industry.
分析化学的基本规律通常被作为一笔化学制品和物理基础提出，分析的方法和程序的法律，公理和方程序。
Fundamentals of analytical Chemistry are usually presented as a sum of chemical and physical foundations, laws, axioms and equations for analytical methods and procedures.
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