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TOEFL IELTS BNC: 3576 COCA: 4370
filternoun [ C ]uk/ˈfɪl.tər/ us/ˈfɪl.t̬ɚ/

filter noun [ C ] EQUIPMENT

C2 any of several types of equipment or devices for removing solids from liquids or gases, or for removing particular types of light滤器；过滤器

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。

filter noun [ C ] TRAFFIC

UK a green, arrow-shaped light that is part of a set of traffic lights and tells drivers when they can turn left or right（表示可左转或右转的）交通分流指示灯

a traffic filter交通分流指示灯
a left/right filter左转／右转指示灯
filterverbuk/ˈfɪl.tər/ us/ˈfɪl.t̬ɚ/

filter verb APPEAR GRADUALLY

C2 [ I + adv/prep ] to appear or happen gradually or to a limited degree慢慢出现；渗入；透过

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。

filter verb REMOVE

C2 [ T ] to remove solids from liquids or gases, or to remove particular types of light, using special equipment过滤

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(s)

filter in
TOEFL IELTS BNC: 3576 COCA: 4370
TOEFL IELTS BNC: 3576 COCA: 4370
filter

verb

filter ♦︎ purify ♦︎ refine ♦︎ strain ♦︎ sieve ♦︎ siftThese words all mean to separate sth from sth else, especially a solid from a liquid or larger solids from smaller solids. 这些词均表示过滤、筛。PATTERNS AND COLLOCATIONS 句型和搭配◆to filter / strain / sieve / sift sth into sth◆to filter / strain / sieve sth through sth◆to filter / purify air / water◆to refine / sieve / sift sugar◆to sieve / sift flour◆to be finely sieved / sifted■ filter [transitive] to pass a substance or light through a special device, especially to remove sth that is not wanted 过滤（物质或光线）◆All drinking water must be filtered.所有饮用水必须经过过滤。◆Use a sunblock that filters UVA effectively.使用能有效滤掉长波紫外线的防晒霜。◆The air was improving as the recyclers filtered out the smoke.由于循环净化器过滤掉了烟雾，空气质量正在改善。■ purify ˈpjʊərɪfaɪ; NAmE ˈpjʊrɪfaɪ [transitive] to make sth pure by removing substances that are dirty, harmful or not wanted 使洁净；净化◆One tablet will purify a litre of water in 10 minutes.一片即可在10分钟内净化1升水。◆House plants can help to purify the air.室内盆栽有助于净化空气。▸ purification ˌpjʊərɪfɪˈkeɪʃn; NAmE ˌpjʊrɪfɪˈkeɪʃn

noun

 [uncountable] ◆a water purification plant滤水厂■ refine rɪˈfaɪn [transitive] to make a substance pure by taking other substances out of it, especially as part of an industrial process 精炼，提炼，去除杂质（尤指作为一道工序）◆The process of refining oil produces several useful chemicals.炼油的过程会产生几种有用的化学品。■ strain [transitive] to pour food or another substance through sth with very small holes in it, for example a sieve, in order to separate the solid part from the liquid part 滤，滤掉（多余的水分）◆Use a colander to strain the vegetables.把蔬菜放在滤器里控控水。◆Strain off any excess liquid.滤掉多余的水分。■ sieve sɪv [transitive] to put sth through a sieve 筛；过筛；滤◆Liquidize or sieve half the soup and return it to the pot.把一半的汤打成浓汁或者滤一下，再倒回锅里。ⓘ A sieve is a tool for separating solids from liquids or larger solids from smaller solids, made of a wire or plastic net attached to a ring. The liquid or small pieces pass through the net but the larger pieces do not. * sieve指筛子、笊篱、漏勺等滤器。■ sift [transitive] to put flour, sugar or some other fine substance through a sieve or sifter 筛（面粉、糖或其他颗粒较细的物质）◆Sift the flour, baking powder and salt into a bowl.把面粉、发酵粉和盐筛到碗里。ⓘ In American English a sifter is a small sieve used especially for sifting flour. 在美式英语中，sifter尤指面粉筛子。
TOEFL IELTS BNC: 3576 COCA: 4370

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