scratch filter

例句：

1. 1.The scratch filter is used to remove impurities from the air before it reaches the final stage of purification.
   刮擦过滤器用于在空气到达最终净化阶段之前去除杂质。
2. 2. The scratch filter was designed to prevent dust particles from entering the clean room.
   刮擦过滤器被设计成防止尘埃颗粒进入洁净室。
3. 3. The scratch filter is essential for maintaining the cleanliness of the air in the productionarea.
   刮擦过滤器对于保持生产区域空气的清洁至关重要。