filtering mat

例句：

1. 1. The filtering mat is used toremove impurities from the water beforeit is consumed.
   过滤布用于在饮用之前去除水中的杂质。
2. 2. The sieve was made of finemesh that allowed only small particlesto pass through.
   筛子由细密的网制成，只允许小颗粒通过。
3. 3. The screen filters out dust and otherdebris from the air before it reaches theventilation system.
   过滤器从空气中筛选出灰尘和其他碎片，然后进入通风系统。