dorsal fin [鱼] 背鳍 ; 脊鳍 ; 脊翅 ; 空气垂直舵稳定器
Origin of dorsal fin 背鳍起点
second dorsal fin 只有第二背鳍
jet dorsal fin 飞机背鳍
first dorsal fin 第一背鳍
No Dorsal Fin 无背鳍
Dorsal fin vein 背鳍静脉
dorsal fin fairing 背鳍整流罩
Dorsal Fin Pale Black 背鳍呈浅黑色
First dorsal fin base length 第一背鳍鳍基长
Its sail-like first dorsal fin provides stability while swimming.
帆状的第一背鳍在游动时提供了稳定性。
This condition, called neoteny, means it keeps its tadpole-like dorsal fin, which runs almost the length of its body, and its feathery external gills, which protrude from the back of its wide head.
这种情况，叫做动态持续，意味着它保留着它的像蝌蚪一样的贯穿整个身体的背鳍，从头后面突出的像羽毛一样的外腮。
They also have broad flippers, a reduced dorsal fin (a larger one would just get in the way in tight spots), and small eyes—echolocation helps them pinpoint prey in muddy water.
鳍状前肢宽大，背鳍退化（较大的背鳍在狭窄处会造成阻碍）小眼睛——因为他们可利用回声，精确定位河泥里的猎物。
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