The Pacific blue fin tuna is a sushi staple.

平洋蓝鳍金枪鱼是寿司的主食。

The image of a dorsal fin cutting through the sea surface is iconic.

背鳍划破海面是种标志性画面。

But for friends who are more far flung, you might be more apt to send a shout out, rather than making the effort to get together to bump fists or fins.

但对于那些相隔较远的朋友，你可能更倾向于大声喊他（她），而不是凑一起碰碰拳头或鲸鳍。

Local whale species include the iconic humpback, fin whales, and the endangered North Atlantic right whale, these photographs captured thanks to a multi-air aerial survey conducted by Tetratech and the New York State Department of Environmental Conservation.

当地的鲸鱼物种包括标志性的座头鲸、长须鲸，还有濒临灭绝的北大西洋露脊鲸，这些照片的拍摄得益于Tetratech和纽约州环境保护部联进行的多空航测。

For 10 out of 10 today, if you think the best place for yellow fin tuna is on a sushi roll, some engineers at the University of Virginia disagree.

节目到尾声，如果你认为吃黄鳍金枪鱼最好的方式是寿司，佛吉尼亚大学的一些工程师恐怕不同意。

Echo and Moon-dancer are noisy too, but Moon-dancer's easy to find because she has a particularly large fin on her back, which makes her easy to identify.

Echo和Moon-dancer也喜欢发出声音，不过Moon-dancer背上的鳍特别大，很好辨认。

This is made possible by their fins, one set at the side and another set underneath the body, and the tail also helps the shark move forward quickly.

这归功于的鳍，一组一侧，另一组身体下面，尾巴也帮助鲨鱼快速的向前移动。

Flippers help a dolphin start, stop, and turn. The fin on a dolphin's back helps it stay balanced. Its powerful tail pushes it through the water.

鳍状肢帮助海豚启动、停止和转向。海豚背上的鳍帮助保持平衡。强有力的尾巴推动中前进。

Yet overfishing and the cruel practice of finning, cutting off shark fins to make exotic soups and returning the wounded creature to the sea to die, are threatening shark numbers.

然而，过度捕捞和割鳍的残忍做法，——割下鲨鱼鳍来做异国风情的汤，然后把受伤的鲨鱼放回大海——正威胁着鲨鱼的数量。

We can see we see fin whales, humpbacks, minkes...the occasional blue whale.

我们可以看到长须鲸、座头鲸、小须鲸......偶尔会看到蓝鲸。

Be forever in the " fin club" of every set free dolphin.

使自己身处自由海豚之中。

He could see their wide, flattened, shovel-pointed heads now and their white-tipped wide pectoral fins.

他这时看得见们那又宽又扁的铲子形的头，和尖端呈白色的宽阔的胸鳍。

Their back ends, several with iconic tail fins, point toward the big Texas sky.

他们的车尾朝着天空，其中几辆还装有极具标志性的汽车尾翼。

Shark fin or not, he will have a lot on his plate after inauguration day.

不管有没有鱼翅，就职典礼之后，他都会有很多事情要做。

They use all kinds of things from a backpack with a softball inside to a ball in a sock on the back to a shark fin type thing to alarms that ring when you roll on your back.

这种疗法会用到各种东西，从装有软球的背包，到背上挂一只装有球的袜子，再到能你仰卧时响起警铃的鲨鱼鳍状物。

The tail ends in a tail fin. There are many different kinds of fish and they are of many different shapes and colours.

尾巴以尾巴上的鳞片尾巴。鱼有很多不同的种类，不同的形状和颜色。

What's wrong with his fin? -He looks funny.

他的鳍是怎么了？-他看起来很有趣。

Mudskippers try the same trick with their brightly coloured fins.

弹涂鱼用们色彩鲜艳的鳍来玩同样的把戏。

It's hard to imagine fins like those evolving into sturdy, weight-bearing limbs… because they didn't.

很难想象这样的鳍能进化成沉重四肢… … 事实上们也做不到。

And so this fin actually causes downforce to take place.

尾翼实际上产生了下压力。