The change in climate might be one of the causes for the extinction of dinosaurs.

气候的变化也许是恐龙灭绝的一个原因。

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For instance, if it hadn't been for the extinction of the dinosaurs, we mammals would never have had an opportunity to flourish.

例如，如果没有恐龙的灭绝，我们这些哺乳动物就不会有机会繁荣昌盛。

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Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.

一些科学家假定，小行星撞击地球导致了恐龙的灭绝。

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To put the potential for damage by an asteroid into perspective, the one that paleontologists believe triggered the extinction of dinosaurs on Earth 65 million years ago was six miles in diameter.

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One of the theories put forward to explain the extinction of the dinosaurs 65 million years ago is that they were wiped out by the catastrophic impact of a large asteroid.

BBC: Asteroid impact centre site selected

Some think that the ten-kilometre meteorite that created it threw so much dust into the atmosphere that it blotted out the sun and led to the extinction of the dinosaurs.

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