1. 不及物动词： 过滤，渗透，走漏
2. 及物动词： 滤过，渗入
可数名词：
1. 过滤器，筛选
2. 滤波器，过滤器，滤光器 词形变化
- 形容词 filterless
- 名称 filterer
- 时态 filtered，filtering，filters
- remove by passing through a filter
- device that removes something from whatever passes through it
- pass through
- run or flow slowly, as in drops or in an unsteady stream
- an electrical device that alters the frequency spectrum of signals passing through it