Each mass extinction may have had a different cause.
每一次大灭绝可能都有不同的原因。
This is the story of wildlife conservation in the age of mass 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。
The mass extinction would have occurred very suddenly under this hypothesis.
在这种假设下，大灭绝的发生是非常突然的。
Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.
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。
Various theories seek to explain this mass extinction.
对于这次大灭绝，有很多种解释。
But the Mesozoic, too, began with a mass extinction.
但中生代本身便是以一次大灭绝开始的。
We're a million years over due for a mass extinction.
我们是一个100万年以上由于大规模灭绝。
Before the mass extinction, the top ocean predators were primitive sharks.
在大规模灭绝之前，高等海洋肉食生物是远古的鲨鱼。
Yet sheer Numbers do not totally explain the current mass extinction.
然而，当前物种的大规模灭绝不光是人口数目激增造成的。
Yet the mass extinction, however remote, that should be concentrating minds is that of mankind.
然而鱼类的大规模灭绝，无论如何遥远，也应该是人类集中精神所要考虑的一件事。
The mass extinction event killed off the dinosaurs and many other animal and plant species.
中找到了元素铱岩层，而这通常会被发现于小行星中。 这次灭绝事件杀光了恐龙以及许多其他动植物物种。
The mass extinction event killed off the dinosaurs and many other animal and plant species.
中找到了元素铱岩层，而这通常会被发现于小行星中。 这次灭绝事件杀光了恐龙以及许多其他动植物物种。
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