听力文本

The objection was based on one simple observation, earth has been hit many times...
这种异议基于一个简单的发现，地球已经遭受过多次碰撞，
and these impacts, even the really big ones, seldom coincide with mass extinctions.
而这种碰撞，哪怕是最大的碰撞，都很少与物种大灭绝相关联。
For the very large craters that we think might have produced global effects,
我们通常认为那些巨大的陨石坑会造成全球性的影响，
in some cases they don't line up with any extinction events whatsoever
但是一方面它们没有关系到任何一次灭绝事件，
and in other cases extinction events, very well dated extinction events
另一方面，就清楚记载的灭绝事件而言，
have occurred that are not associated with any impacts.
它们的发生都与碰撞无关。

Because of this, some scientists had long doubted that any impact could have wiped out the dinosaurs
基于这个原因，一些科学家一直都在怀疑究竟是不是大碰撞导致了恐龙消失，
and now there is new evidence which seems to reinforce those suspicions.
现在他们的疑虑有了新的证据作为支撑。
The new evidence relates to the forest fires that were said to have raged all over the world.
这些新的证据，与据说肆虐了整个世界的森林大火有关。
They seem to have been supported by soot in the KT boundary layers,
支持该理论的证据是存在于第三纪界线层中的烟灰，
but the problem with soot is that it can be blown thousands of miles from where the burning actually happened,
但是烟灰有可能是从实际发生火灾的数千英里之外被吹到这里来的，
so one researcher decided to investigate a more reliable kind of evidence... charcoal!
所以一位研究人员决定着手调查一种更为可靠的证据：木炭！

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