minimum detectable activity

例句：

1. 1. Theresearchers found that the minimum detectable activitylevel was too low to be detected.
   研究人员发现，最低可检测活性水平太低无法被检测到。
2. 2. The drug had a minimumdetectable activity of 0.1micrograms per milliliter.
   该药物的最低可检测活性为每毫升0.1微克。
3. 3. The study aimedto determine the minimum detectable activity levelfor this compound.
   该研究旨在确定这种化合物的最低可检测活性水平。