A species once extinct is gone forever.
一个物种一旦灭绝就永远消失了。
Many of the planet’s species went extinct, but the crurotarsans weathered the storm.
地球上的很多物种都灭绝了，但是crurotarsan平安的渡过了这次危机。
Why do certain species go extinct?
为何存在某一种类灭绝？
Will it make a difference... if these species go extinct?
如果这些物种灭绝······会有什么差别呢？
This is an extinct species of fish.
这是一种已经灭绝的鱼。
By the end of this century, 25 percent of all bird species may be extinct.
到本世纪末，四分之一的鸟类可能会灭绝。
This species will be extinct in a few decades.
几十年后这个物种将会灭绝。
This is an extinct species of fish.
这是一种已经灭尽的鱼。
Unfortunately, such a rare species is now faced with the danger of being extinct.
不幸的是，这种稀有物种现在正频临灭绝的危险。
The state of being destroyed or becoming extinct, as a species of animal.
作为动物的一个物种，处于被消灭或消亡的状态。
Unfortunately, such a rare species is now faced with the danger of being extinct.
不幸的是，这种稀有物种此刻正频临灭绝的危险。
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。
In South America Darwin found fossils of extinct animals that were similar to modern species...
达尔文在南美洲发现一些类似于现代物种的灭绝动物化石。
Many species of animals have become extinct.
许多动物已经绝迹了。
This species will be extinct in a few decades.
这是一种已经灭绝的鱼。
Nevertheless, not doing this way, these species will then become extinct.
但不这样，这个物种就会灭绝。
Sometimes, however, a particularly large number of species have become extinct relatively suddenly.
但有时，相当数量的物种会相对突然地灭绝。
My car aims to bring back the species that have gone extinct back to life.
我的车的目的是带回了已经灭绝起死回生的品种。
Which species would take over the world if humans went extinct?
如果人类灭绝了，哪类物种会统治世界？
Many animal species in the world are becoming extinct nowadays.
目前，世界上的很多动物正在灭绝。
Many animal species in the world are becoming extinct nowadays.
目前，世界上的很多动物正在灭绝。
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