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英语翻译The wastewater is characterized by a strong dark color,h

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英语翻译
The wastewater is characterized by a strong dark color,high chemical oxygen demand (COD) concentration,presence of refractory volatile organic compound and low biodegradability.
presence of refractory volatile organic compound 应该翻译成什么?含有难挥发有机物?
晕 不是要用在线翻译翻译
英语翻译The wastewater is characterized by a strong dark color,h
该污水的特点是颜色深黑,化学需氧量(COD)偏高,表现为污水中含有难降解挥发性有机化合物,污水的生物降解度也低.