| 单词 | filter |
| 释义 | filter n. & v. --n 1. a porous device for removing impurities or solid particles from a liquid or gas passed through it. 2. = filter tip. 3. a screen or attachment for absorbing or modifying light, X-rays, etc. 4. a device for suppressing electrical or sound waves of frequencies not required. 5. Brit. a an arrangement for filtering traffic. b a traffic-light signalling this. --vintr. & tr. 1. pass or cause to pass through a filter. 2. (foll. by through, into, etc.) make way gradually. 3. (foll. by out) leak or cause to leak. 4. Brit. allow (traffic) or (of traffic) be allowed to pass to the left or right at a junction while traffic going straight ahead is halted (esp. at traffic lights). Phrases and idioms filter-bed a tank or pond containing a layer of sand etc. for filtering large quantities of liquid. filter-paper porous paper for filtering. filter tip 1. a filter attached to a cigarette for removing impurities from the inhaled smoke. 2. a cigarette with this. filter-tipped having a filter tip. Etymology: F filtre f. med.L filtrum felt used as a filter, f. WG |
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