detection threshold

例句：

1. 1. The detection threshold for this virus is very low.
   这种病毒的检测阈值非常低。
2. 2. The new drug has a detection threshold of 0.01 micrograms per liter.
   新药的检测阈值为每升0.01微克。
3. 3. The research team set the detection threshold at 0.5ppm.
   研究团队将检测阈值设定为0.5ppm。