sensitive threshold

例句：

1. 1.The researchers found that the sensitive threshold for detecting pollutants had been exceeded.
   研究人员发现检测污染物的敏感阈值已经超出。
2. 2.The scientist used a sensitive threshold to measure the concentration of the substance.
   科学家使用一个敏感阈值来测量该物质的浓度。
3. 3.The company has set a sensitive threshold for acceptable returns on investment.
   该公司已设定一个敏感阈值，以接受投资回报率。