filter
noun [ C ] uk/ˈfɪl.tər/ us/ˈfɪl.tɚ/
(EQUIPMENT)
C2 滤器;过滤器
any of several types of equipment or devices for removing solids from liquids or gases, or for removing particular types of light
a water filter 滤水器
a dust filter 滤尘器
Ozone is the earth's primary filter for ultraviolet radiation. 臭氧层是地球上阻挡紫外线辐射的主要屏障。
(TRAFFIC)
UK（表示可左转或右转的）交通分流指示灯
a green, arrow-shaped light that is part of a set of traffic lights and tells drivers when they can turn left or right
a traffic filter 交通分流指示灯
a left/right filter 左转／右转指示灯
filter
verb uk/ˈfɪl.tər/ us/ˈfɪl.t̬ɚ/
(APPEAR GRADUALLY)
C2 [ I + adv/prep ]慢慢出现;渗入;透过
to appear or happen gradually or to a limited degree
News filtered down to us during the day. 白天的时候消息慢慢传到了我们这里。
Reports about an accident began to filter in. 有关一起事故的报道开始慢慢传开。
Sunlight filtered through the branches. 阳光从树枝间洒落下来。
(REMOVE)
C2 [ T ]过滤
to remove solids from liquids or gases, or to remove particular types of light, using special equipment
The water is filtered to remove any impurities. 这种水经过滤以去除杂质。
Devices in the two chimneys would filter (out) (= remove) radioactive dust. 两个烟囱里的装置可以滤除放射性尘埃。
Phrasal verb
filter in （车辆）平稳并线
to join a line of moving traffic without causing other vehicles to slow down