你可以根据鳍的形状来辨认这种鱼。
海豹的鳍肢与人类的手臂同源。
一个人需要两个单鳍，每只脚一个。
海豹、海龟、企鹅均有鳍状肢。
企鹅把翅膀当作鳍来使用。
除了头部和鳍状肢外，棱皮龟的全身都有鲸脂保护。
Insulation protects the leatherback everywhere but on its head and flippers.
蜜雪儿伸出她的手，轻柔地触摸着其中一只海豚的鳍。
Michelle reached out her hand and gently touched the fin of one of the dolphins.
鱼龙是与恐龙同时代的爬行动物，它有鳍和流线型的身体。
Ichthyosaurs were reptilian contemporaries of the dinosaurs, with fins and streamlined bodies.
解决办法是让鳍肢冷却下来，而不把热量从海龟身体的其他部分带走。
The solution is to allow the flippers to cool down without drawing heat away from the rest of the turtle's body.
"如果海龟没有符合流体动力学结构的鳍的话，他们也不能解决这个问题。
There is not much that the turtle can do about this without compromising the aerodynamic shape of the flipper.
它们有不同的形状、大小、颜色、鳍、牙齿、栖息地、饮食、性格、繁殖方法和其他属性。
They have different shapes, sizes, color, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes.
它们有不同的形状、大小、颜色、鳍、牙齿、栖息地、饮食、性格、繁殖方式和其他属性。
They have different shapes, sizes, colors, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes.
2005年，科学家们在新几内亚的南部水域得到了一个意想不到的发现：一种叫做矮鳍的海豚新物种。
Scientists made an unexpected discovery in the waters south of New Guinea in 2005: a new species of dolphin called the snub-fin.
虽然游泳者的动作可能是平稳和流畅的，但人们既没有鳍来保持漂浮或产生速度，也没有鳃用于在水下呼吸。
While the swimmer's movements may be smooth and fluid, people have neither fins to stay afloat or generate speed, nor gills to deal with going under.
舒宾的杰出成就是带领了一次北极探险。在这次探险中，他们发现了一种半鳍半肢的动物——一条有腕的鱼化石。
Shubin distinguished himself by leading an expedition to the Arctic, which uncovered the remains of a fish with a wrist-a creature with part fin and limb.
这只绿海龟只能在很有限的范围里游，因为她只有一只鳍。
The green sea turtle, could only swim around in a very limited range because she only had one flipper.
棱皮龟通过将鳍状肢底部的血管排列成逆流交换系统来完成这一过程。
The leatherback accomplishes this by arranging the blood vessels in the base of its flipper into a countercurrent exchange system.
鳍状肢可能确实是水生生物的必要反应，海龟、鲸鱼和儒艮也有鳍状肢。
Flippers may indeed be a necessary response to aquatic life, turtles, whales, and dugongs also have them.
此外，海象和海豹用它们的后鳍推动自己在水中运动，而海狮用它们的前鳍。
Moreover, walruses and seals drive themselves through the water with thrusts of their hind flippers, but sea lions use their front flippers.
在鳍足类动物中发现的共同的细节设计，这可能说明了它们有一个共同的祖先。
The common detailed design found among the pinnipeds probably indicates a common ancestor.
生物学家们长期认为，两类鳍脚亚目动物，即海狮和海象，都是从一种陆地上的类似于熊的动物繁衍而来的。
Biologists have long maintained that two groups of pinnipeds, sea lions and walruses, are descended from response to similar environmental pressures.
鲨鳍小翼看起来非常锋利！
这个医学之迷起于十六个月之前，大西洋黑鳍鲨死了。
The medical mystery began 16months ago after the death of the Atlantic blacktip shark.
哦，鲨鱼有漂亮的鳍，亲爱的。
实际上，海龟的鳍状肢里是有骨头的。
车身使用的铬越多，鳍越大，越值钱。
然而，反“削鳍”法中却有很明显的漏洞。
But there are loopholes in antifinning laws that are easy to exploit.
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