Some whale species are dying off because climate change has affected their supply of food.

由于气候变化影响了鲸类的食物供应，些鲸类正在灭绝。

It said that numbers of species have recovered enough to permit whaling.

报告显示，许多鲸类已恢复至允许捕捞的数量。

Whales return to the warmth of western Greenland, amongst them are narwhals.

鲸类纷纷回到温暖的西格陵兰海岸。其中的是角鲸。

And it was only one of many species of carnivorous whales in the middle Miocene.

而且，它只是中新世中期众多食肉鲸类中的。

It is China's only large whale found in coastal waters.

自此，它们成为了我国唯动于近岸的大型鲸类。

Cetaceans are really sensitive to sound.

鲸类对声音非常敏感。

They primarily feed on marine mammals, like seals, porpoises, dolphins, sea lions, and even other whales occasionally.

它们主要以海洋哺乳动物为食，如海豹、鼠海豚、海豚、海狮，甚至偶尔会猎杀其他鲸类。

Those vertical lines entangle and kill endangered sea turtles and multiple whale species-including the North Atlantic right whales.

这些竖绳缠住并杀死濒临灭绝的海龟和包括北大西洋露脊鲸在内的多鲸类。

There's a huge difference in the fact that the whales would have sonar and could use that to detect food.

鲸类能够用声纳来探测食物的事实带来了巨大区别。

He was probably the father of modern whale research.

他或许是现代鲸类研究之父。

And orcas are just part of Brian's multi-year whale project.

而虎鲸只是布莱恩多年鲸类项目的部分。

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，各以大牌投资人为代表。

Is it other sharks, other whales, or something else?

是其他鲨鱼、其他鲸类，还是别的什么生物呢？

I think the damage to whale populations has contributed to growing environmental consciousness.

我认为鲸类群受到的损害有助于增强人们的环保意识。

There are two types of whales in the world, toothed whales and baleen whales.

世界上有两鲸类：齿鲸和须鲸。

There are lots of different species of whales.

鲸类有许多不同的类。

Rolland and her team studied baleen, a substance found in the upper part of the mouth of some kinds of whale.

罗兰和团队研究了鲸须，位于某些鲸类嘴巴上部的物质。

Several species, including the humpback and blue whales, can travel for over a thousand miles without feeding.

包括座头鲸和蓝鲸在内的几鲸类，能够在不进食的情况下游行超过千英里。

Without plankton, which is the global term for these tiny organisms, there would be no whales.

没有了这些浮游生物，也就是这些微生物的全球术语，鲸类也就不复存在了。

However, the discovery of certain fossils provided crucial evidence that pointed toward the whale's evolutionary past.

然而，某些化石的发现提供了指向鲸类进化历史的重要证据。