帆状的第一背鳍在游动时提供了稳定性。
Its sail-like first dorsal fin provides stability while swimming.
鲨鱼的背鳍像刀样迅速划破水面。
鲨鱼的背鳍被渔夫割了下来。
它的背鳍就在我的前面，我尖声呼救。
Its dorsal fin was in front of me. I was screaming for help.
我们能知道是因为可由大背鳍区别为雄性。
We know this because we can distinguish the male by their large dorsal fin .
细长的大型海生无鳞鱼，有尖牙和船帆形的长背鳍。
Large elongate scale less oceanic fishes with sharp teeth and a long sail-like dorsal fin.
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 backs were battleship gray topped with a saw-toothed line of small yellow dorsal fins.
背鳍、脂鳍和尾鳍稍带浅黄色，胸鳍、腹鳍和臀鳍灰白色。
Dorsal fin, tail fin and fat fins slightly yellow, pectoral fin, and ventral fin Tunqi gray.
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 humpback has a small dorsal fin located towards the tail flukes about two-thirds of the way down its back.
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。
The ages of S. yunnanensis can be identified through the characteristics of the annual rings of the scales, otoliths and dorsal fin spines.
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。
The most important part of our scientific observation was to see whether they had nicks on their 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。
Any of several whales of the family Balaenidae, characterized by a large head, whalebone plates in the mouth, and absence of a dorsal fin.
在成千上百的孔雀鱼品种中，雄鱼最著名的特色就是它们华丽的背鳍和尾鳍。
Among the hundreds of guppy varieties, the best known feature of the male fish is its gorgeous dorsal and caudal fins.
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。
They are cobalt-blue on top and silvery-white below, with a pronounced dorsal fin and a long, lethal, spear-shaped upper jaw.
雷珠阿测量队于2005年开始测量，他们用网捕获14头独角鲸，在其背鳍装上电子传感器。
Laidre's team began taking measurements in 2005, by capturing 14 narwhals (Monodon monoceros) in nets and attaching the electronic gear to the animals' dorsal fins.
神仙鱼的体型既高又扁，有着向后舒展的长长背鳍和臀鳍，常以虾、蠕虫等为食，体长可达12厘米。
The Angel Fish has an elongated and flat shape with long dorsal and anal fins extending backwards. It usually feeds on shrimps and worms and can measure up to 12 cm long.
这是我吃过的最好吃的鱼，不过，我也得到了一个惨痛的教训，鳜鱼的背鳍有毒，被它扎伤，会非常疼。
It was the most delicious fish I think I've ever eaten, although I learned the hard way that the guiyu's dorsal spines contain a poison which can inflict a painful wound if you are stuck by them.
这种古老的爬行动物背上有着标志性的船帆状背鳍，它常常会被误认为是一种恐龙，甚至出现在恐龙玩具中。
This reptile, with its iconic sail-shaped back, is often mistakenly identified as a dinosaur, and is even included in packages of toy dinosaurs.
一开始，人们猜想这一背鳍是用来进行体温调节的。借助它，动物可以克服外界剧烈的温变而保持体温稳定。
It was originally suggested that the fin was used for thermoregulation — self-regulation of body temperature — even when outside temperatures may vary drastically.
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。
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.
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。
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.
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 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.
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 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.
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.
至于这个显眼的背鳍的作用是什么，自从1878年古生物学家爱德华·库珀(EdwardCope)在德州首次发现以来，专家们一直争论不休。
The purpose of the prominent fin that defines this species has been debated since it was first discovered by paleontologist Edward Cope in Texas in 1878.
至于这个显眼的背鳍的作用是什么，自从1878年古生物学家爱德华·库珀(EdwardCope)在德州首次发现以来，专家们一直争论不休。
The purpose of the prominent fin that defines this species has been debated since it was first discovered by paleontologist Edward Cope in Texas in 1878.
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