| 单词 | filter |
| 释义 | filter —filterer, n. /fil"teuhr/, n. 1. any substance, as cloth, paper, porous porcelain, or a layer of charcoal or sand, through which liquid or gas is passed to remove suspended impurities or to recover solids. 2. any device, as a tank or tube, containing such a substance for filtering. 3. any of various analogous devices, as for removing dust from air or impurities from tobacco smoke, or for eliminating certain kinds of light rays. 4. Informal. a filter-tipped cigarette or cigar. 5. Photog. a lens screen of dyed gelatin or glass for controlling the rendering of color or for diminishing the intensity of light. 6. Electronics , Physics. a circuit or device that passes certain frequencies and blocks others. 7. Math. a collection of subsets of a topological space, having the properties that the intersection of two subsets in the collection is a subset in the collection and that any set containing a subset in the collection is in the collection. v.t. 8. to remove by the action of a filter. 9. to act as a filter for; to slow or partially obstruct the passage of: The thick leaves filtered the sunlight. 10. to pass through or as through a filter. v.i. 11. to pass or slip through slowly, as through an obstruction or a filter: Enemy agents managed to filter into the embattled country. [1375-1425; late ME filtre < ML filtrum felt, piece of felt used to strain liquids < Gmc; see FELT2] Syn. 11. penetrate, sift, seep, trickle, leak. |
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