| 单词 | porpoise | 
| 释义 | porpoise1 of 2noun  por·poise  ˈpȯr-pəs  1   : any of a family (Phocoenidae) of small gregarious toothed whales    especially : a blunt-snouted usually dark gray whale (Phocoena phocoena) of the North Atlantic and North Pacific that typically ranges from 5 to 6 feet (1.5 to 1.8 meters) in length  2   : dolphin sense 1a(1)  —not used technically  Note: While not closely related, porpoises and dolphins share a physical resemblance that often leads to misidentification. Porpoises typically have flat, spade-shaped teeth, triangular dorsal fins, and shortened beaks with relatively small mouths while dolphins have cone-shaped teeth, curved dorsal fins, and elongated beaks with larger mouths. porpoise2 of 2 verb  porpoised; porpoising; porpoises   intransitive verb 1   : to leap or plunge like a porpoise  penguins … porpoise out of the water 2   : to rise and fall repeatedly   | 
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