chronic threshold concentration

例句：

1. 1.The patient's blood glucose level was measured at the chronic threshold concentration.
   患者的血糖水平在慢性阈值浓度下被测量。
2. 2.The study found that the chronic threshold concentration of lead in the soil could be reduced by using a new method.
   研究发现，使用一种新的方法可以降低土壤中铅的慢性阈值浓度。
3. 3. The researcher analyzed the data and determined that the chronic threshold concentration of mercury in the water was within safelimits.
   研究者分析了数据并确定水中汞的慢性阈值浓度在安全范围内。