滤过性病毒

例句：

1. 1. Viruses can be filtered out in a water treatment plant.
   在水处理厂，病毒可以被过滤掉。
2. 2. The researcher found that the filterable agent was responsible for the disease.
   研究者发现，这种滤过性病毒是导致疾病的罪魁祸首。
3. 3. The filterable agent is believed to have been introduced into the environment through human activities.
   人们相信，这种滤过性病毒是通过人类活动引入环境的。