| 单词 | filter bed |
| 释义 | filter bednouna pond or tank having a false bottom covered with sand and serving to filter river or pond waters. Origin of filter bedFirst recorded in 1870–75 Words nearby filter bedfils, filt., filter, filterable, filterable virus, filter bed, filter bubble, filter cake, filter factor, filter feeder, filter feeding Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for filter bedfilter bed nouna layer of sand or gravel in a tank or reservoir through which a liquid is passed so as to purify itCompare bacteria bed any layer of material through which a liquid is passed so as to filter it Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 |
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