| 单词 | filter bed |
| 释义 | > as lemmasfilter bed filter bed n. a layer of sand, gravel, or other porous material serving as a filter; a pond or tank incorporating such a layer. ΘΚΠ the world > physical sensation > cleanness and dirtiness > freedom from impurities > removal of impurities > filtering or percolating > [noun] > filter or percolator > others filter bed1828 physeter1842 sack-filter1875 biofilter1936 permeator1975 1828 London Lit. Gaz. 29 Nov. 763/2 A project said to be in contemplation by the company for cleansing the foul water, by means of excavations and filter-beds. 1881 Pop. Sci. Monthly June 283/2 The filter-bed, which may be composed of any suitable material, is contained in a closed cylinder. 1948 L. E. H. Whitby Nurses' Handbk. Hygiene (ed. 8) ii. 46 After storage the water is allowed to percolate slowly through a filter-bed. 2010 Observer 21 Mar. (Guide to Pets) 37/2 Carefully add the gravel to a depth of around 5cm... This acts as the filter bed. < as lemmas |
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