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。

Yes, with a fine toothed comb, as usual.

是的，跟往常一样，一字不漏。

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

事实上，一些齿鲸和蝙蝠会发出 20 万赫兹左右的声脉冲收听反射声。

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.

齿鲸和须鲸通常都潜入深海捕食，因为深海里的猎物更多。

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.

总的来说，大鲸鱼有两种。齿鲸，如抹香鲸，捕食单个猎物。

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，他就不能受到一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位。