名词
中文翻译：追踪浓度
同义词：
['trace concentration', 'trace level', 'trace concentration level']
例句：
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1. The scientist used a trace concentration of mercury to detect the presence of pollutants in the water.
科学家使用微量的汞来检测水中的污染物。
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2.The police are trying to trace the source of the poisoning incident.
警方正在试图追踪这起中毒事件的源头。
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3.The researchers found trace concentrations of heavy metals in the soil samples.
研究人员在土壤样本中发现了重金属的痕量。