Toothed whales thus do seem to have hit some sort of size limit.

因此，齿似乎确实有某种上限制。

Nah, the difference in size is too big: sperm whales can reach 62 ft in length, which makes them the largest toothed whales in the world.

不会，它们相差太大了：抹长可达 62 英尺，世界上最大齿。

Yes, with a fine toothed comb, as usual.

，跟往常一样，一字不漏。

But today, based on features around the base of its massive teeth, most experts think it was probably in a separate family whose members are all now extinct, called Otodontidae, also known as the Mega-Toothed sharks.

在现代，根据巨齿鲨牙齿基部特征分析，大多数专家认为它可能属于另一个完全不同、现在已经全部灭绝鲨鱼家族，这个家族被称为巨齿鲨科，通常也被叫做巨齿鲨家族。

It features a pair of jaws called mandibles with toothed inner edges that cut up and crush solid foods, like leaves or other insects.

它具有特征就这样一对爪子模样下颌骨，在其内侧有着用来碾碎、咀嚼用牙齿，通常吃树叶或者其它昆虫。

They have very keenly developed echo location sonar sense associated with their brains that is a unique feature of toothed whales.

它们有与大脑相关非常发达回声定位声纳感觉，那齿独一无二特点。

Toothed whales, they found, are living on the edge, size-wise.

他们发现就而言，齿生活在危险边缘。

The sperm whale is the largest toothed whale, yet it's only a quarter of that of the blue whale.

抹最大齿，但它只有蓝四分之一。

But if he had not walked outside, he would not have been inspired by a kind of toothed grass.

但如果他不走出家门，他就不能受到一种锯齿状草启发。

Then you'd use a toothed tool and a smaller hammer for more detailed work in modeling the form.

然后会使用一个齿形工具和一个更小锤子进行更详细建模工作。

Light doesn't travel well underwater. So dolphins and other toothed whales navigate like bats, using echolocating clicks.

光在水中会衰减。所以海豚和其他齿类动物在水中用回声定位，就像蝙蝠一样。

Broadly, big whales come in two varieties. Toothed whales, such as sperm whales, hunt individual prey.

总来说，大鱼有两种。齿，如抹，捕食单个猎物。

Both toothed and baleen whales often hunt by diving deep-prey being more abundant at depth.

齿和须通常都潜入深海捕食，因为深海里猎物更多。

Lots of different features also help animal ears hit especially high notes, like the extra hard, stiff middle ear bones of toothed whales; like dolphins and sperm whales, which efficiently propagate high-frequency vibrations.

许多不同特征也有助于动物耳朵捕捉特别高音调，比如齿中耳骨特别坚硬，像海豚和抹一样，能有效地传导高频振动。

Indeed, some toothed whales and bats emit sound pulses around 200,000 hertz and listen for the reflections.

事实上，一些齿和蝙蝠会发出 20 万赫兹左右声脉冲收听反射声。

And with that, they've evolved from being toothed whales.

就这样，它们从有齿类进化而来。

But best of all no gap toothed kid in sight to wreck it.

但最好没有门牙有缝隙孩子在附近破坏它。

In toothed whales like orcas, grandmothers care for th... by sharing food and knowledge.

在如虎这样齿群中，祖母们通过分享食物和传授知识来照顾后代。

Because it is a scimilar toothed cat.

因为它一种类似犬齿猫。

They're the largest toothed predator on the planet.

它们地球上最大有齿捕食者。