contact biological filter

例句：

1. 1.The contact biological filter is designed to remove pollutants from the air before they reach the ground.
   接触式生物过滤器设计用来在污染物到达地面之前去除它们。
2. 2. The new model of the contact biological filter has been tested in various environments and shown tobe effective.
   新型接触式生物过滤器模型已经在各种环境中进行了测试，并显示出了有效性。
3. 3. The contact biological filter is an important tool for controlling air pollution in urban areas.
   接触式生物过滤器是控制城市地区空气污染的重要工具。