Many dolphins can dive to depths of 200 metres.
许多海豚可潜到200米深。
Occasionally dolphins slap the water with their tails or churn it up in play.
海豚偶尔会在戏耍时用它们的尾巴拍打海水或剧烈地翻腾海水。
Many dolphins are accidentally killed through entanglement with fishing equipment.
很多海豚因捕鱼设备的缠绕而意外死亡。
我对海豚感兴趣。
我与海豚一同玩过。
What are the trainer and dolphins doing?
训练者和海豚在做什么？
My favorite animals are dolphins and rabbits.
我最喜欢的动物是海豚和兔子。
The dolphins used their tails to swim even faster.
海豚用它们的尾巴游得更快。
To test how responsive dolphins are to various signals.
测试海豚对各种信号的反应。
Amazingly enough, the dolphins achieved a 100% success rate.
令人惊讶的是，海豚的成功率达到了100%。
But it's also been found in elephants and bottlenose dolphins.
但在大象和宽吻海豚身上也发现了这种物质。
A previous study noted that dolphins always consciously control their breathing.
先前的一项研究指出，海豚总是有意识地控制自己的呼吸。
Michelle reached out her hand and gently touched the fin of one of the dolphins.
蜜雪儿伸出她的手，轻柔地触摸着其中一只海豚的鳍。
The fossils look like dolphins and they surely lived like dolphins, in the water.
这些化石看起来像海豚，它们肯定像海豚一样在水中生活。
But in order to get their fish, both dolphins had to press the levers in the correct order.
但为了得到他们的鱼，两只海豚都必须按正确的顺序按压杠杆。
If the light was kept steady, the dolphins were supposed to press the levers in reverse order.
如果光线保持稳定，海豚应该以相反的顺序按压杠杆。
Even if the oil spill was not the direct cause of dolphins' death, it still could be a factor.
即使石油泄漏不是海豚死亡的直接原因，它仍可能是一个因素。
So the researchers believed that the dolphins knew the ones in the mirror were just themselves.
所以研究人员相信海豚知道镜子里的就是它们自己。
One of the most interesting experiments with dolphins must be one done by Doctor Jarvis Bastian.
最有趣的海豚实验之一一定是贾维斯·巴斯蒂安博士做的实验。
During deep sleep, the participants' brains behaved in a similar manner seen in birds and dolphins.
深度睡眠时，参与者的大脑表现与鸟类、海豚相似。
When the dolphins saw themselves in the mirror, they tried to clean the red marks off their bodies.
当海豚看到镜子里的自己时，它们试着擦掉身上的红色印记。
For example, dolphins, as well as other marine animals, shut down one hemisphere of the brain when they go to sleep.
例如，海豚以及其他海洋动物，在睡觉时会关闭半边大脑。
They did studies with monkeys and dolphins that provide evidence that these animals have the ability to feel uncertainty.
他们对猴子和海豚进行了研究，提供证据证明这些动物具有感受不确定性的能力。
First of all, he kept the two dolphins together in the same tank and taught them to press levers whenever they saw a light.
首先，他把两只海豚放在同一个水箱里，教它们无论什么时候看到光就按控制杆。
If the light flashed on and off several times, the dolphins were supposed to press the left-hand lever followed by the right-hand one.
如果灯亮了又灭了好几次，海豚就应该先按左手的杠杆，再按右手的杠杆。
The results of two recent unrelated studies support the idea that dolphins may share certain cognitive abilities with humans and great apes.
最近两项不相关的研究结果支持了这样一种观点，即海豚可能与人类和类人猿具有某些相同的认知能力。
In polluted environments, dolphins gradually accumulated toxins in their body fat, and the larger the dolphin, the more accumulated toxin it can tolerate.
在被污染的环境中，海豚体内的脂肪会逐渐积聚毒素。海豚的体型越大，它所能承受的毒素就越多。
For several days, she was followed by a small group of dolphins.
一连几天，她身后都跟着一小群海豚。
Since very few people now lived along that coast, the only other living animals we saw for the first few days were dolphins and birds.
由于现在已经很少有人居住在那条海岸了，在最初的几天里，我们看到的其他唯一活着的动物就是海豚和鸟类。
Why then did dolphins evolve to become so brainy?
那么为什么海豚的智商进化到如此之高呢？
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