filter choke coil

例句：

1. 1. The filter isdesigned to remove impurities from thewater.
   这个过滤器设计用来去除水中的杂质。
2. 2. The scientist used a filter to collectsamples for analysis.
   科学家使用过滤器来收集样本进行分析。
3. 3. The filter was so effective thatit could catch even the smallest particles.
   过滤器非常有效，甚至能捕捉到最小的颗粒。