The halflife periods of biodegradation of 20 organic pollutants in the Songhuajiang River were obtained through determination of the variation of the biochemical oxygen demand (BOD) with time with the standard test method.是什么意思_The halflife periods of biodegradation of 20 organic pollutants in the Songhuajiang River were obtained through determination of the variation of the biochemical oxygen demand (BOD) with time with the standard test method.在线翻译_英语_读音_用法_例句