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。
They are cobalt-blue on top and silvery-white below, with a pronounced dorsal fin and a long, lethal, spear-shaped upper jaw.
它的顶部是钴蓝色，下面和银白色；有着明显的背鳍，还有着长长的、能致命的矛状上颚。
Witnesses reported seeing a dorsal fin and thrashing in the water before the sea turned red and the man vanished at the scene on Australia's west coast.
目击者称看到有鲨鱼背鳍在水面上时隐时现，后来发现海水变成红色，而那名男子也从澳大利来西海岸上消失了。
The dorsal fin coloration of the male is a circular red spot ringed with blue which scientists said reminded them of Obama's campaign logo.
这条雄性的鱼，背鳍是蓝色，上面带着红色圆形点，科学家们表示会联想到奥巴马的竞选标志。
Now he speeded up as he smelled the fresher scent and his blue dorsal fin cut the water.
它闻到了这新鲜的血腥气，此刻正加快了速度，蓝色的脊鳍划破了水面。
The most important part of our scientific observation was to see whether they had nicks on their dorsal fin.
我们要做的科学观察最重要的部分是看看在他们的背鳍上是否有小疤痕。
Large elongate scale less oceanic fishes with sharp teeth and a long sail-like dorsal fin.
细长的大型海生无鳞鱼，有尖牙和船帆形的长背鳍。
It is not unusual to see a striper 's dorsal fin whizzing past you while casting in knee deep water.
这不是不寻常的看到一个变色的背鳍驰驱，过去你而铸造的膝盖深的水。
Perch: snub-nosed bony freshwater fish with an oval body and a spiny dorsal fin; the flesh of this fish is highly valued.
鲈鱼：塌鼻子、食肉性淡水硬骨鱼类，椭圆形的身体、多刺的背鳍；肉质美味。
The characteristics of three kinds of age determination materials, otoliths scales and dorsal fin spines from Gymnocypris cuoensis had been described and compared in their using in age determination.
在描述鳞片、背鳍条和矢耳石三种材料轮纹特征的基础上，比较了这些年龄鉴定材料在判读错鄂裸鲤年龄和反映生长特征上的异同。
The humpback has a small dorsal fin located towards the tail flukes about two-thirds of the way down its back.
驼背鲸有一个较小的背鳍，大约是背部三分之二接近尾部的中央。
The ages of S. yunnanensis can be identified through the characteristics of the annual rings of the scales, otoliths and dorsal fin spines.
云南倒刺鲃的年龄可以通过鳞片、耳石、背鳍条上的年轮特征来鉴定。
Any of several whales of the family Balaenidae, characterized by a large head, whalebone plates in the mouth, and absence of a dorsal fin.
露脊鲸：露脊鲸科中的几种鲸，特征为头部硕大、嘴边长有鲸须而无背鳍。
A small North American freshwater fish (Stizostidion canadense) having a spotted, spiny dorsal fin.
一种产于北美的小型淡水鱼（鰤鲈） ，长有带斑点的刺状脊鳍。
Dorsal fin, tail fin and fat fins slightly yellow, pectoral fin, and ventral fin Tunqi gray.
背鳍、脂鳍和尾鳍稍带浅黄色，胸鳍、腹鳍和臀鳍灰白色。
This paper deals with the numerical solution of the Euler equation for airfoils using approximate boundary conditions and the effects dorsal fin on vortex over delta wing at high angles of attack.
本论文主要是通过实验来研究细长圆锥体在大迎角下的绕流流场的特性和细长三角翼加背鳍后对前缘涡的影响，检验相关理论结果。
This paper deals with the numerical solution of the Euler equation for airfoils using approximate boundary conditions and the effects dorsal fin on vortex over delta wing at high angles of attack.
本论文主要是通过实验来研究细长圆锥体在大迎角下的绕流流场的特性和细长三角翼加背鳍后对前缘涡的影响，检验相关理论结果。
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