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。
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.
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.
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.
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.
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.
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.
实际上，海龟的鳍状肢里是有骨头的。
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.
鳐鱼科，包括黄貂鱼和灰鳐，通过击打鳍的末端向前游动。
Fish of the family Rajidae, which includes stingrays and skate, swim by flicking the outer edges of their fins.
橙色的圆鳍鱼始终在游动，海底的冰始终闪烁着绿光。
All the while, the orange lumpsucker swims, and the ice glows green undersea.
每一个不锈钢餐具都有奇妙的鱼造型，有鱼尾，鳍，嘴和眼睛。
Each piece in this stainless steel cutlery set is whimsically fish-shaped, right down to tail, fins, mouth, and eyes.
座头鲸鳍部前缘的波纹结构能帮助它优雅灵活的穿梭于海水之中。
Ripples on the leading edge of humpback fins help the whales slice through water with grace and dexterity.
废弃的钓鱼线和渔网会困住海洋生物，割伤它们的鳍或扼死它们。
Discarded fishing lines or nets entrap sea life, amputating fins or strangling them.
美国和瑞士的科学家研究了非洲湖泊中的棘鳍类热带淡水鱼。
Scientists in the U.S. and Switzerland were studying the cichlids that live in African lakes.
帆船有许多种不同类型的固定龙骨，例如全龙骨(见上图)及鳍板。
Sailboats have many different types of fixed keels, such as full keels (see photo) and fin keels.
从上世纪50年代起，大西洋西北部和中部的远洋白鳍鲨数量减少了85%。
Since the 1950s, the oceanic whitetip has declined 85% in the northwest and central Atlantic.
而大型动物通过用它们的鳍或肢体滑水的方式游泳，这种方式在微观比例下是低效率的。
Whereas large animals swim by pushing against water with their fins or limbs, this approach is ineffective at very small scales.
黑鳍礁鲨虽然广泛分布于太平洋，但似乎只是生活在其周围很小范围内的暗礁群。
Blacktip reef sharks (Carcharhinus melanopterus), although widespread around the Pacific, appear to have small ranges within their home reef system.
她的仿生鳍就像个舵，用来保持平衡。这只海龟已经学会用独特的方式划那只完好的鳍来变方向。
Her prosthetic fin acts like a rudder and keeps her stable. The turtle has learned how to flap her one good flipper in unique ways to change direction.
她的仿生鳍就像个舵，用来保持平衡。这只海龟已经学会用独特的方式划那只完好的鳍来变方向。
Her prosthetic fin acts like a rudder and keeps her stable. The turtle has learned how to flap her one good flipper in unique ways to change direction.
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