| 单词 | pectoral fin |
| 释义 | pectoral fin noun[C] biologyspecializeduk/ˈpek.tər.əl ˌfɪn/us/ˈpek.tɔːr.əl ˌfɪn/thefinon eachsideof afishnear thefrontofitsbody, used forcontrollingthedirectionthefishgoes in and forslowingit down 胸鳍（鱼身体前面两侧的鳍，用于控制和减速）Substances & structures in the body
Examplesofpectoral finpectoral fin This fish has dorsal andpectoralfinspines. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.Pelvic fins are absent, and relatively smallpectoralfincan be found near the midline, followed by the head and gill-covers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Thepectoralfindisc of the deepsea skate has a moderately triangular anterior margin, a broadly rounded posterior margin, and rounded tips. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These neurons are electrically coupled with motoneurons which innervate extraocular, jaw and opercular muscles and mediatepectoralfinadduction in hatchetfish. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It has a diamond-shapedpectoralfindisc wider than long, with nearly straight front margins converging to a triangular snout. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Thepectoralfinis falcate, and also longer than the head. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The lateral line dips strongly after thepectoralfin, having 50 to 53 scales on the upper section and 43 to 52 keeled scutes posteriorly. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The breast of the longnose trevally is scaleless, extending up to behind the pelvic fin origin and laterally to thepectoralfinbase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It has an ovalpectoralfindisc with a long, flexible, broad-angled snout. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The gill openings are narrow, not extending below thepectoralfinbase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Thepectoralfindisc of the shagreen ray is somewhat wider than it is long. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The undulatorypectoralfinmotion diagnostic to this taxon is known as rajiform locomotion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The most prominent diagnostic feature is two dark spots at the base of thepectoralfin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The two most caudal rays of eachpectoralfinare detached from the rest of the fin, and angled in a ventral direction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The head and body plates are covered with odontodes; these are larger on the ventral face of pelvic andpectoralfinspines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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