filter
/ˈfɪltər/
device that removes something from whatever passes through it
Chinese meaning: 过滤器；滤光镜
A water filter can remove impurities and improve the taste.
水过滤器可以去除杂质并改善口感。
Photographers often use a polarizing filter to reduce glare.
摄影师经常使用偏振滤镜来减少眩光。