这项研究帮助机构部门识别并理解影响健康和环境的过程，有助于EPA评估由人类和生态系统造成的污染的风险系数。
This research helps the Agency identify and understand the processes that affect our health and environment, and helps EPA evaluate the risks that pollution poses to humans and ecosystems.
油田开发过程中，由于污染物的排放，对油田周围的生态系统将产生一定的影响。
Development of an oil field often causes pollution to its surrounding areas, negatively affecting the ecological environment therein.
石油化工生产过程中产生的炼油污水，含有多种污染物，对生态环境造成严重污染。
The refinery wastewater produced in petrochemical production contains kinds of pollutants, and badly pollutes the ecological environment.
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