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

他们发现就体型而言，齿鲸生活在危险边缘。

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

因此，齿鲸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.

齿鲸和须鲸通都潜入深海捕食，因为深海里的猎物更多。

Yes, with a fine toothed comb, as usual.

是的，跟往，字不漏。

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

总的来说，大鲸鱼有两种。齿鲸，如抹香鲸，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，些齿鲸和蝙会发出 20 万赫兹左右的脉冲收听反射。

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。所以海豚和其他齿鲸类动物在水中用回，就像蝙。

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

然后会使用个齿形工具和个更小的锤子进行更详细的建模工作。

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

但是如果他不走出家门，他就不能受到种锯齿状的草的启发。

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

大致上讲，这些动物填补了由现代齿鲸目动物海豚和虎鲸所占据的生态龛。

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

它们有与大脑相关的非发达的回纳感觉，那是齿鲸独无二的特点。

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

因此，它们已经从齿鲸进化而来。

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

但最重要的是， 看不到有缝隙的孩子来破坏它。

Its name actually means " toothed turtle." And those teeth looked nothing like pareiasaur teeth.

它的名字实际上意味着“有齿的乌龟”。那些牙齿看起来点也不像翼龙的牙齿。

They're the largest toothed predator on the planet.

它们是地球上最大的有齿捕食者。

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

这种齿鲸也有非大的大脑和复杂的社会生活。

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，齿鲸是没有嗅觉的。

Baleen whales are larger than toothed whales and include humpback, blue, gray, and mink whales.

须鲸比齿鲸更大，包括座头鲸、蓝鲸、灰鲸和小须鲸。

Toothed whales developed echolocation, a way to use sound waves to explore their surroundings.

齿鲸发展出了回能力，这是种利用波探索周围环境的方法。

The toothed whales include sperm whales, orcas, dolphins, and porpoises.

齿鲸包括抹香鲸、虎鲸、海豚和鼠海豚。