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.
但是在恐龙灭绝之前，另一件事件引起了大规模的生物进化。
But well before all that happened, another event triggered a different burst of evolutionary activity.
但是在恐龙灭绝之前，另一件事件引起了大规模的生物进化。
But well before all that happened, another event triggered a different burst of evolutionary activity.
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