词典释义：
a porous device for removing impurities or solid particles from a liquid or gas passed through it
（过）滤器
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an oil filter .滤油器。
short for
<Bold>FILTER TIP</Bold>的简称。
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[as modifier]
a cheap filter cigarette .廉价的过滤嘴香烟。
a screen, plate, or layer of a substance which absorbs light or other radiation or selectively absorbs some of its components
滤光器（或片）；射线过滤板
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filters can be used in photography to reduce haze .滤光器在摄影中可用来减少雾霾。
a device for suppressing electrical or sound waves of frequencies not required
滤波器。
〈英〉 （车辆的）分流
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[as modifier]
a filter lane .分流车道。
a traffic light signalling such an arrangement, typically one partly blacked out to form an arrow
（尤指箭头状的车辆）分流灯。
【计算机】 筛选程序。
pass (a liquid, gas, light, or sound) through a device to remove unwanted material
过滤（液体，气体，光，声音）
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the eye filters out ultraviolet radiation 眼睛能将紫外线滤去
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figurative 〈喻〉you'll be put through to a secretary whose job it is to filter calls .你的电话将被接到一个负责筛选来电的秘书那儿。
【计算机】 过滤。
[no obj., with adverbial of direction]move slowly or in small quantities or numbers through something or in a specified direction
缓慢（或少量）地通过（或行进）
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people filtered out of the concert during the last set .终曲声中，人们缓缓走出了音乐厅。
(of light or sound)enter a place slowly or in small quantities
（光，声）透入
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sunlight filtered in through the thin curtains. 阳光透过薄薄的窗帘射了进来。
[no obj., with adverbial](of information)gradually become known
（消息）走漏，渐渐传开
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the news began to filter in from the hospital .消息开始慢慢从医院里传入。
[no obj., with adverbial of direction]
〈英〉 （车辆在直行车辆遇红灯受阻时）被允许在路口向左（或向右）转弯行驶。
"late Middle English （denoting a piece of felt）: from French
