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。
Of course, humanity is currently setting off the sixth mass extinction event in Earth's history.
当然，人类正在引发地球历史上第6次物种大灭绝。
Overall, each mass extinction event has rid the planet of up to 96 percent of its species each time.
总的来说，每次大规模的灭绝事件都使地球减少96%的物种。
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