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。

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。

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。

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。

Why did Neanderthals become extinct?

为什么尼安得塔人会灭绝呢？

"We're going to become extinct," he said.

“我们将要灭绝，”他说。

"Homo sapiens will become extinct, perhaps within 100 years," he said.

“智人可能会在100年内灭绝，”他说。

Without nature preserve, more animals are likely to become extinct.

如果没有自然保护区，很有可能更多的动物将要灭绝。

If there did not exist some one who loved, the sun would become extinct.

人间如果没有爱，太阳也会灭。

If we continue to destroy the countryside, many more animals will become extinct.

我们若继续破坏乡村环境，将会有更多的动物绝种。

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。

If we do not create nature reserves, more animal species will probably become extinct.

如果没有自然保护区，很有可能更多的动物将要灭绝。

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。

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。

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。

It will be a blessing when certain breeds become extinct or leave the planet because they do not belong here.

当某些品种绝迹或离开地球，这或许是一种祝福，因为他们原本就不属于这里。