他们已经把犀牛逼到了灭绝的边缘。
因栖息地正受到破坏这一物种已濒于灭绝。
This species has nearly died out because its habitat is being destroyed.
成立这个协会是为了保护濒危物种不致灭绝。
The society was set up to preserve endangered species from extinction.
很多树种濒临灭绝。
一项行动正在展开来拯救一个鳄鱼种类使其免遭灭绝。
An operation is beginning to try to save a species of crocodile from extinction.
一个物种一旦灭绝就永远消失了。
每一次大灭绝可能都有不同的原因。
是什么导致了如此高的物种灭绝率？
灭绝是一个很难理解的概念。
让我们以现在已经灭绝的美洲猎豹为例。
我们都知道熊猫是一种濒临灭绝的物种。
We all know that panda is a species that is on the edge of extinction.
在这种假设下，大灭绝的发生是非常突然的。
The mass extinction would have occurred very suddenly under this hypothesis.
并不是所有的大型哺乳动物都在那个时期灭绝了。
为什么科学家们想要了解更多关于恐龙灭绝的信息？
Why did scientists want more information about the dinosaur extinctions?
即使细菌真的从火星来到地球，它们也一定已经灭绝了。
Even if bacteria did arrive on Earth from Mars, they must have died out.
现存的6800种语言中，已经有400多种濒临灭绝。
Already well over 400 of the total of, 6,800 languages are close to extinction.
这是个关于在大规模的物种灭绝时代保护野生动物的故事。
This is the story of wildlife conservation in the age of mass extinction.
因此，许多科学家得出结论，第六次大规模物种灭绝正在发生。
Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.
例如，一个移居的物种可能会因缺乏食物而灭绝。
A translocated species could die out from lack of food, for example.
从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。
Extinct but already fully marine cetaceans are known from the fossil record.
有些埃德里企鹅种群已经灭绝。
Some of the Adele penguin colonies have already gone extinct.
如果没有小行星，就不会有灭绝了吗？
曾经在过去一个时期，我几乎濒临灭绝。
所以至今，它们没有灭绝。
恐龙灭绝就是这样的例子。
一旦语言灭绝，全部文化也将就此失传。
With the extinction of a language, an entire culture is lost.
一旦语言灭绝，全部文化也将就此失传。
With the extinction of a language, an entire culture is lost.
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