The skull also lacks a blowhole, another cetacean adaptation for diving.

颅骨上缺少一个可以进行适应性潜水的排气孔。

At new risk are cetaceans like the North Atlantic right whales.

对北大西洋露脊鲸这类鲸目科来讲同样面临着这种新的致命危险。

Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans.

这项非常令人兴奋的发现终于使科学家们能够重建鲸目最有可能的起源。

I'm from Mystic Aquarium in Mystic, Connecticut. I'm a trainer of cetaceans and pinnipeds there.

来自康涅狄格州的神秘水族馆。一名鲸目和鳍足类教练。

It is one of the earliest whales and the oldest cetacean discovered that had functional legs.

它最早发现的鲸目之一，也最早发现的有腿的鲸目。

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

大致上讲，这填补了由现代齿鲸目海豚和虎鲸所占据的生态龛位。

Our frigate drew nearer to the cetacean. I examined it with a completely open mind.

们的战舰埃近了这个鲸鱼类。

What can be this cetacean, which neither Cuvier nor Blumenbach knew anything about?

居维叶和布鲁门巴赫都不知道的这只鲸类到底什么？

Every cetacean known to man is endangered.

任何人类已知的鲸类。

Ichthyosaurs also resembled cetaceans in another way: unlike most living reptiles, which lay eggs, they gave birth to live young.

大多数现存的爬行靠产卵繁殖，而鱼龙通过怀胎产子的。

The venture cetaceans can be divided into three big subspecies, each typified by big-name investors.

创业鲸类可分为三大亚种，各以大牌投资人为代表。

If saving cetacean species from extinction.

如果依靠国际捕鲸委员会。

Like other aquatic mammals, such as dolphins and porpoises, this wolf-sized animal, known as Pakicetus, is part of the cetacean group.

像其他水生哺乳，如海豚和鼠海豚一样，这种体型像狼一样大小的被称为巴基斯坦古鲸，鲸类的一员。

If it was a cetacean, it exceeded in bulk any whale previously classified by science.

如果它鲸类，那么它的体积就超过了之前科学分类的任何鲸鱼。

Some very early cetaceans have this ankle bone, too, which tells us that cetaceans evolved from artiodactyls.

一非常早期的鲸类也有这种踝骨，这告诉们鲸类从偶蹄类进化而来的。

The cetacean had rammed our frigate at about eleven o'clock in the evening.

战舰跟那鲸鱼冲撞的时间在夜间十一点钟左右。

No argument, sir, since our craft breathes in the manner favored by cetaceans.

那不用说，先生，因为们的船跟鲸鱼类一般呼吸的。

And elephants, cetaceans, parrots and some rodents are suspected of it, though so far the evidence concerning them is anecdotal.

大象、鲸类、鹦鹉和一啮齿被怀疑与它有关，尽管到目前为止有关它们的证据都轶事。

Like a cetacean's tail, its propeller churned the waves slowly.

它的推进器像鲸鱼类的尾巴一般，慢慢地冲开海浪。

The authorities in Australia say a further 200 whales have become stranded off Tasmania, taking the total number of beached cetaceans to 470.

澳大利亚当局表示，又有200头鲸鱼在塔斯马尼亚搁浅，使搁浅的鲸类总数达到470头。