C 过滤，过滤器a thing used for holding back the solid parts in a liquid or gas

　acoustic ～　消声器
　domestic ～　家用过滤器
　yellow ～　黄色滤光镜
　cloth ～　用布过滤的滤器
　sand ～　用沙过滤的滤（水）器
　～ tip　过滤嘴香烟
　pass sth through a ～　过滤某东西

　The lake water passes through a filter before it is piped to our homes.　湖水过滤后用管道输送到各家各户。
　They purified water by a filter.　他们用过滤器净化水。

1. vt. & vi.透过，过滤　 send sth through a filter
2. vi.（消息等）走漏　 become known gradually

　～ light　露出亮光
　～ water　过滤水
　～ off　滤掉（某物）
　～ out　滤出，泄露
　～ out the facts　泄露出去事实真相
　～ through　逐渐被理解
　～ into　渗入，传入
　～ into the country　渗入国内
　～ into Japan　渗入日本
　～ into people's minds　渗入人心
　～ through　渗透，滤过，透露
　～ through clouds　透过云层
　～ through the sand　渗透沙层

　She went on separating, boiling, evaporating, filtering and mixing.　她不断地进行分离、熬煮、蒸发、滤清、调制。
　Charcoal is used to filter water.　木炭是用来过滤水的。
　The sunglasses is used to filter the light.　太阳镜用于滤光。
　Water and soil would have to be filtered many times to remove any radioactive matter.　水和土壤须经过多次过滤以消除放射性物质。

 ♣ filter from　(v.+prep.)
　从…过滤出来　pass through a filter
　The solid particles were filtered from the solution.　固体微粒是从溶液中过滤出来的。
 ♣ filter in　(v.+adv.)
　透过，滤过　pass or flow slowly
　Sounds of cheering filtered in through the closed window.　欢呼声透过关闭的窗户传了进来。
 ♣ filter into　(v.+prep.)
　渗透，滤过　pass or flow slowly
　Water filters into the well.　水渗透入井里。
　Light filtered into the room.　光线透进了房间。
　The enemy agents managed to filter into the embattled country.　敌人间谍设法钻进那个严阵以待的国家。
　Foreign influence began to filter into the country.　外国势力开始渗透进这个国家。
 ♣ filter out　(v.+adv.)
1. 滤除，过滤 remove sth from a liquid
　This metal net filters out the dirt.　这个金属网滤掉污物。
　You have to filter out the dirt before using the water.　在使用这种水之前，必须先过滤，以除去污物。
　The solids were filtered out and only the liquid passed into the container.　固体物质被过滤出来，只有液体流进容器。
2. 泄漏（消息等） become known(news, etc.)
　The news of his appointment filtered out before it was officially advertised.　他被任命的消息在还没正式公布前就被透漏出去。
 ♣ filter through¹　(v.+adv.)
　走漏　become known gradually
　The news slowly filtered through to everyone in the office.　这消息慢慢走漏出去，结果办公室的人全知道了。
 ♣ filter through²　(v.+prep.)
　透过，滤过　pass through gradually
　A liquid filters through a strainer, into the receptacle beneath.　液体经过过滤器流入下面的容器。
　Water filters through the sandy soil and into the well.　水透过沙土，渗透到井里。
　The sunlight filtered through the curtains.　阳光透过窗帘映了进来。
　The sunlight filtered through the thick leaves.　阳光透过茂密的树叶照射下来。
　You filter the coffee through this special paper and it takes out the bitterness.　如果你用这种特制的纸过滤咖啡，就没有苦味了。
　The water was filtered through charcoal.　这水用木炭过滤过的。

　［同义词］ n. strainer
　［词源］中古拉丁语fitrum（毛毡）