active level

例句：

1. 1. The active level ofthe virus in the patient's bloodis high.
   患者血液中病毒的活性水平很高。
2. 2. The research team found that the activelevel of the pollutant in theair was increasing.
   研究团队发现空气中污染物的活性水平在增加。
3. 3. Theactive level of the drugin the patient's systemis low.
   患者体内药物的活性水平很低。