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恐龙是因为小行星撞击灭绝的吗? – 译学馆
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恐龙是因为小行星撞击灭绝的吗?

Did an asteroid kill the dinosaurs?

>>AKI WATANABE (paleontologist, NYIT & AMNH): Did an asteroid kill the dinosaurs?
是小行星撞击让恐龙灭绝了吗
[MUSIC] [BOOM] >>WATANABE:
[音乐][砰]
Paleontologists agree that an
古生物学家认为
asteroid did strike Earth at the end of the Cretaceous period,
约在六千六百万年前的白垩纪末期
at around 66 million years ago.
有一颗小行星撞击了地球
And we know this
我们对此都深信不疑
because there is an impact crater in the Yucatan Peninsula of
因为在墨西哥的尤卡坦半岛
what’s now Mexico.
有个陨石坑
And the rock layers
当时的石头图层
from that age include an element called iridium which is rare on
显示里面有一种地球上很稀少
Earth but relatively abundant on asteroids.
而在行星上相对丰富的铱元素
And you can learn more about the asteroid itself by clicking the link here.
点击这里的链接了解更多小行星的知识
It obviously had a drastic impact
很明显这对地球上的生物
on life forms on Earth, including dinosaurs like
包括霸王龙 三角龙这样的恐龙
T-rex and Triceratops.
带来了巨大的影响
So because the asteroid was really big,
因为行星实在是太大了
the impact would have had global consequences,
所以这撞击带来的一定是全球性的影响
both immediate and then also long-term.
不仅来的快 持续时间也很长
There would have been initial effects like forest fires and giant tsunamis,
开始的效果就像是森林火灾 大海啸
but the projectiles
但是撞击带来的落弹数
that came off of the impact would have led to impact winters
将会导致冬季的冲击
which would have cooled
会使地球冷却
down the Earth and also blocked sunlight from hitting the ground.
致使地面吸收不到阳光
And the vegetation would have suffered,
植被大量枯死
which would have led to the collapse of a lot of ecosystems.
导致许多生态系统崩溃
So its very clear
所以很明显
that the asteroid impact had a major effect on life on Earth.
地球生物受到的主要影响是小行星撞击
But what we’re trying to figure out is
但是我们想要得出的是
whether the asteroid was the only factor, or the major
小行星撞击是导致恐龙灭绝的
factor that led to the extinction of dinosaurs.
唯一因素还是首要因素
Some palentologists have proposed
一些古生物学家提出
that the dinosaurs were already on a decline before
恐龙早在小行星撞击之前
the impact of the asteroid.
就已经在减少了
But this hypothesis is difficult to prove just
不过这个假设很难证明
because we don’t have a clean complete
因为我们没有清楚完整的
record of dinosaurs right before, during, and after the extinction event.
恐龙灭绝之前之中之后的记录
So it’s hard to tell
所以很难说
whether all the dinosaurs were already on a path to extinction, even
是不是恐龙在经历小行星撞击前
without help from the asteroid impact.
就已经在慢慢灭绝了
There’s also evidence of an increase in volcanic activity at that time.
还有证据显示那时候火山活动频繁
There was a lot of lava and volcanic particles spewing out from under ground.
有许多的火山岩浆和颗粒从地底下喷涌而出
This would have led to similar effects as the impact winters.
这和冬天的冲击有类似的影响
So the increase
所以火山活动的增加
in volcanism might have contributed additional forces that led to
可能是促使恐龙灭绝的
the extinction of dinosaurs.
另外诱因
It’s not all doom and gloom though.
尽管地球并不全是昏天黑地
One dinosaur group we know as birds did survive through the extinction event.
像鸟类的那种恐龙可以在灭绝事件中存活
And also us mammals did as well.
我们远古的哺乳动物同样也可以
What the fossil record tells us is that certain animals,
化石记录告诉我们
usually smaller-bodied and also those
身体体积小的和生活在海洋的
that lived in the oceans tended to fare better at this extinction event.
在灭绝时期存活得更好
So all the animals that are alive today represent descendants
所以现在活着的生物
from a group that actually did
代表的是在这次小行星撞击中
survive this asteroid impact.
幸存的那些生物的后代
So to answer the original question,
回答最开始的问题
the asteroid impact did have a devastating
小行星撞击的确给恐龙
effect on the dinosaurs.
造成了毁灭性的打击
But paleontologists are still working out the finer details.
但古生物学家还发现更精确的细节
And learning more about this extinction event,
并且对这个灭绝事件了解得更加清楚
could help us to learn about other extinction events,
可以帮我们了解其他的灭绝事件
including the one we’re facing right now.
包括我们现在面临的这个
Thanks for watching the video.
谢谢收看本期视频
To learn more about the asteroid,
想要了解更多有关小行星
make sure to click the link above for
确认点击以上链接
this weeks’ space video.
观看这周的空间视频
And if you have any questions about dinosaurs,
如果你有任何关于恐龙的问题
leave them in the comments section below.
请在下面评论区留言
Don’t forget to subscribe to the AMNH channel
记得订阅AMNH
for more videos like this!
获取更多相关的视频

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视频概述

恐龙灭绝的原因

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视频来源

https://www.youtube.com/watch?v=2B9XmiOIA4E

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