当你在一群鱼旁边浮潜时，你会看到每一条鱼都以同样的速度游动。
When you go snorkeling by a school of fish, you will see every single one of those fish swimming along at the same speed.
不过，走鲸的脊椎结构显示，即使没有尾片，它们在水中同样能够像现代鲸鱼那样通过身体后面部分的上下摆动来游动。
The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.
它们还必须不停地游动以避免下沉，因为大多数鱼基本上或完全失去了鱼鳔，这个充满气体的囊帮助大多数其他鱼保持浮力。
They must also keep swimming to keep from sinking, since most have largely or completely lost the swim bladder, the gas-filled sac that helps most other fish remain buoyant.
海马常用尾巴将自己固定在水草或珊瑚枝上，以过往的浮游动物为食。
Anchoring themselves to blades of grass or fingers of coral with their tails, seahorses spend their time feeding on zooplankton.
在蛹阶段，它们不吃食物，但在水面游动时会靠两个细小的管道呼吸空气。
During the pupa stage, they do not eat foods but do sit at the surface and breathe air through two small tubes.
这种细长蜿蜒的身体能让陆地上的蛇在茂密的草丛中爬行，也能让水蛇在水中游动。
The elongated, serpentine body that allows land snakes to slither through dense grass also serves aquatic snakes in propelling through the water.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
人们提出了许多理论来解释食草动物，如浮游动物，在控制浮游植物高度集中地区的食草动物方面所起的作用。
Many theories have been formulated to explain the role of grazers such as zooplankton in controlling the excluded grazers from regions of high phytoplankton concentration.
不过真实的鱼群并不只是转圈游动。
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.
梭鱼群形成了一堵墙，两条白顶鲨鱼绕着鱼墙游动。
While looking at the wall of barracudas, a couple of white tip sharks swam around the wall.
长高的野草在寒风中象鳗鲡似的蠕蠕游动。
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.
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.
伦敦市场有强大的品牌，易懂的规则和游动资金。
London's market has a strong brand, its rules are well understood, and there is money sloshing around.
这种动物有一个长而扁平的尾巴，并会在靠近水面的地方游动。
This creature has a long flat tail and swims close to the surface of the water.
在这个天堂般的小岛上，你甚至能看到热带鱼在大海里四处游动。
On this island paradise, you can even see tropical fish swimming about in their ocean home.
舟，虽然还是白天看到的空舟，但水波中似乎有什么东西在游动。
Although the boat was still empty as seen during the daytime, in the water waves there seems to be something in swimming.
只有很小的鱼苗才能在这个世界上最小的鱼缸内自由游动。
Only baby fish can fit inside the tiny glass cube that is the world’s smallest aquarium.
这是走兽，飞鸟，和水中游动的活物，并地上爬物的条例。
These are the regulations concerning animals, birds, every living thing that moves in the water and every creature that moves about on the ground.
被追的鱼显然被声音弄胡涂了，开始绕着圈子回游，或者索性停止游动。
The fish being chased apparently became confused by the sounds and began to either swim around in circles or stop swimming altogether.
有时我觉得自己是个野男孩，或者是一个海狸在水中快速游动。
Sometimes I felt like I was a wild boy, or a beaver sliding through the water.
鳕鱼吃西鲱鱼，西鲱鱼吃浮游动物，而浮游动物又以藻类为食。
Cod eat sprats, a small, herring-like species that eat microscopic Marine creatures called zooplankton that in turn eat the algae.
因此这些幼体海豚能流畅地游动在它们母亲游动引起的滑流中。
The calves meanwhile benefited by gliding in their mother's slipstream.
这些哺乳动物不幸成为人类所需要的一堆游动着的商品，如皮毛、油和肉。
Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil and meat.
鱼的大脑掌控着神经来指挥鱼鳍摆动，这样鱼儿就能到处游动了。
And a fish gets around just fine. Nerves based in the fish's brain instruct its fins to move, and off it goes.
这对现在可以随时享用超便利大餐的浮游动物而言是个天大的恩惠。
The growth is a boon for zooplankton, who now have ready access to an easy-to-find feast.
在每次物种灭绝之中，大量的菊石和体平面为少量浮游动物所替代。
After each extinction, a rich variety of ammonoid species and body plans was replaced by a few free-floating types.
新西兰的海豹警惕地在白色大鲨鱼的上面游动，大白鲨是海里最大的食肉鱼类。
New Zealand fur seals swim warily above a great white shark, the largest predatory fish in the seas.
新西兰的海豹警惕地在白色大鲨鱼的上面游动，大白鲨是海里最大的食肉鱼类。
New Zealand fur seals swim warily above a great white shark, the largest predatory fish in the seas.
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