detecting threshold

例句：

1. 1.The researchers found that the detection threshold for this virus is very low.
   研究人员发现这种病毒的检测阈值非常低。
2. 2. The new drug has a detecting threshold of less than 10 nanograms per milliliter.
   新药的检测阈值低于每毫升10纳克。
3. 3.The scientists have set a detecting threshold for the pollutants in the air.
   科学家们已经设定了空气中污染物的检测阈值。