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

们发现就体型而言，生活在危险边缘。

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

因此，似乎确实有某种体型上的限制。

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

和须通常都潜入深海捕食，因为深海里的猎物更多。

Yes, with a fine toothed comb, as usual.

是的，跟往常一样，一字不漏。

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

总的来说，有两种。，如抹香，捕食单个猎物。

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

事实上，一些和蝙蝠会发 20 万赫兹左右的声脉冲收听反射声。

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。所以海豚和其类动物在水中用回声定位，就像蝙蝠一样。

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

然后会使用一个形工具和一个更小的锤子进行更详细的建模工作。

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

抹香是最的，但它的体型只有蓝的四分之一。

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

但是如果不走家门，就不能受到一种锯状的草的启发。

Roughly speaking, these animals filled the ecological niches now occupied by toothed cetaceans such as dolphins and killer whales.

致上讲，这些动物填补了由现代目动物海豚和虎所占据的生态龛位。

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

它们有与脑相关的非常发达的回声定位声纳感觉，那是独一无二的特点。

That makes them the largest toothed whale.

这使得它们成为最的。

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

就这样，它们从有类进化而来。

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

但最好是没有门牙有缝隙的孩子在附近破坏它。

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

在如虎这样的群体中，祖母们通过分享食物和传授知识来照顾后代。

We'll get to toothed whales in a minute, but first, let's answer your question, Tyler.

我们稍后会谈到，不过首先，泰勒，让我们来回答你的问题。

This toothed whale also has a very large brain and complex social life.

这种也有非常的脑和复杂的社会生活。

They're the largest toothed predator on the planet.

它们是地球上最的有捕食者。

For example, it appears from their brain structure that toothed species are unable to smell.

比如，从它们的脑部结构来看，是没有嗅觉的。