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以上来源于: WordNet
N any unpaired median fin on the backs of fishes and some other aquatic vertebrates: maintains balance during locomotion 背鳍
Their backs were battleship gray topped with a saw-toothed line of small yellow dorsal fins.
它们的背部是军舰的灰色，最上方是呈锯齿状的黄色背鳍。
Their body color and appearance were observed and recorded. and 29 items which covered body length, body weight, perimeter, dorsal fins and teeth etc.
对其体色及外部形态进行观察，并测定体长、体重、体围、鳍和齿式等29个项目。
They were documenting the dorsal fins of sharks, as part of an identification program, when a 10-foot-long great white shark suddenly landed on their vessel.
那天在莫斯湾的船上他正在与其他六名船员正在进行对鲨鱼群背部鳍记录的识别项目，一只10英尺长的大白鲨突然间跃上他们的船舷。
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