filter

英 /ˈfɪltə/ 　美 /ˈfɪltər/

n. 过滤器；滤网a device that removes unwanted substances from liquid or air
v. 过滤；筛选to remove unwanted substances or select information using particular conditions
v. 缓缓透入；逐渐传开to pass through or spread gradually

The water filter needs replacing before we leave.

我们出发前需要更换净水滤芯。

Modern treatment plants filter wastewater to remove harmful substances before releasing it into local rivers.

现代污水处理厂会过滤污水，去除有害物质后再将其排入当地河流。

搭配

air filter 空气过滤器filter out impurities 滤除杂质filter search results 筛选搜索结果light filters through 光线透过

filter out后接被滤除的东西，不是保留下来的。

filtration (n.)、filtered (adj.)、unfiltered (adj.)