| 单词 | perch | 
| 释义 | perch [pǝrch]  MECHANICS 1. Also known as pole; rod.  2. A unit of length, equal to 5.5 yards, or 16.5 feet, or 5.0292 meters.  3. A unit of area, equal to 30.25 square yards, or 272.25 square feet, or 25.29285264 square meters.  NAVIGATION A staff placed on top of a buoy, rock, or shoal as a mark for navigators; a ball or cage is sometimes placed at the top of the perch, as an identifying mark.  VERTEBRATE ZOOLOGY 1. Any member of the family Percidae.  2. The common name for a number of unrelated species of fish belonging to the Centrarchidae, Anabantoidei, and Percopsiformes.  | 
	
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