1. filter bed
   n.滤垫,滤水池
   
2. filter out
   渗漏,滤除
   
3. filter paper
   n.滤纸(尤指定量滤纸)
   
4. filter tip
   n. 过滤嘴
   
5. air filter
   空气过滤器
   
6. fuel filter
   燃料过滤器，燃油滤清器，滤油器
   
7. high-pass filter
   高通滤光片
   
8. light filter
   n.(=colour filter)滤光器
   
9. low-pass filter
   低通滤波器
   
10. oil filter
    油性过滤器
    
11. water filter
    水滤器，滤水器
    

1. All drinking water must be filtered.
   饮用水均须过滤净化。
2. These new ideas were filtering into their minds.
   这些新思想正渗入他们的心里。
3. People began filtering into the hall.
   人们开始慢慢步入大厅。
4. We must filter out the dirt.
   我们必须滤除尘垢。
5. Sunlight filtered in through the dusty window.
   阳光从满是灰尘的窗子透进去。

　2个名词解释

　3个动词解释