At the current rate of decline, many of the rain forest animals could become extinct in less than 10 years.
按照目前的下降速度，许多雨林动物不到十年就会绝种。
We must protect these endangered animals before they become extinct.
在这些濒危动物灭绝之前，我们必须保护它们。
They will tum out to be the second-largest species of birds to become extinct.
它们将成为第二大灭绝的鸟类。
If these great cats become extinct, the smaller animals they prey upon will overpopulate the forests.
如果这些大型猫科动物灭绝了，那么它们捕食的小型动物将会使森林中物种的密度过高。
However, it is announced that the Chinese paddlefish living in the Yangtze River has become extinct (灭绝) .
然而，据报道，生活在长江的中国白鲟已经灭绝。
Cases in which many species become extinct within a geologically short interval of time are called mass extinctions.
许多物种在地质上很短的时间间隔内灭绝的情况称为大灭绝。
Meteorite impacts can be advantageous for some species, which thrive, and disastrous for other species, which become extinct.
陨石的撞击对某些物种是有利的，它们会茁壮成长；而对其他物种则是灾难性的，它们会灭绝。
This was a landscape where antelope of all kinds abounded—along with Bos primigenius, a kind of oxen that has become extinct.
这是一片充满了各种羚羊的土地——还有原牛，一种已经灭绝的牛。
In America, 53 languages have become extinct since 1950, more than in any other country.
美国自从1950年以来已有53种语言灭绝，比其它任何国家都要多。
Initially, there were 26 Formosan languages, but many of them have become extinct.
台湾南岛语言起初有二十六种，不过大多数都已失传。
As far as I know, a great many species of fish have become extinct in this century.
据我所知，本世纪有很多种鱼已经灭绝了。
Can we continue to "be" on this planet, or will we become extinct like the dinosaurs?
我们能继续“生存”在这个地球上吗？抑或我们会像恐龙一样灭绝？
I think if some animals become extinct, it would be a huge regret for the human race.
我想，若某些动物绝种，是人类非常遗憾的事。
A kind of animal become extinct when it dies out. Like dinosaurs. Dinosaurs are extinct.
一种动物种类全死掉后，就是灭绝。就像恐龙一样，它已经灭绝了。
He said he was not only told that we would become extinct, but when and how it would happen.
他说，他不只是说我们会成为灭绝，但何时及如何，它会发生。
Some species of animals have Become extinct Because they could not adapt to a changing environment.
有一些动物已经灭种了，因为它们不能适应环境的变化。
Scientists estimate that 150-200 species of plant, insect, bird and mammal become extinct every 24 hours.
科学家估计，每过24小时，就有150至200种植物、昆虫、鸟类和哺乳动物灭绝。
Nature is a victim of the upheaval on Earth, and over a long period many species have become extinct.
大自然是地球上发生动乱的受害者，在很长的一段时期，许多的地球物种消亡了。
They are one of the few species so ancient that they watched the dinosaurs evolve and become extinct.
他们是少数如此古老的品种之一，他们看到恐龙类进化和变成灭绝。
Despite diminishing - and eventually disappearing - summer Arctic ice, polar bears will not become extinct.
尽管夏季北极冰川正在减少，并最终消失，北极熊却不会灭绝。
The team warns in the journal PLoS Biology that many species will become extinct before they can be studied.
研究团队在《公共科学图书馆·生物学》(PLoS Biology)中警告说，许多物种会在得到研究前灭绝。
More mammals have become extinct in that country over the last 200 years than in any other place in the world.
在过去的200年前，这个国家中灭绝的哺乳动物物种比世界上的其他任何地方都要多。
And they have quite devastating effects. Many species have become extinct as a result of introduced mammals.
它们造成了灾难性的破坏，一些物种已经因此灭绝了。
The east Germanic tribes settled east of the Oder River, but their languages have long since become extinct.
东部的日耳曼各部落定居在奥得河以东地区，但是他们的语言早就消失了。
When one or More predator animals become extinct, there is an increase of the animals that they use for food.
当一种或多种食肉动物灭绝了，它们捕食的动物就会增加。
We can tell from fossil evidence in rocks that many living species have become extinct over the millions of years since life began.
我们可根据岩石里的化石得出结论：自生命开始数百万年以来，许多物种已经灭绝了。
We can tell from fossil evidence in rocks that many living species have become extinct over the millions of years since life began.
我们可根据岩石里的化石得出结论：自生命开始数百万年以来，许多物种已经灭绝了。
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