BBC纪录片地平线《地球劫难日》第20期:金属元素铱
日期:2019-08-23 08:54

(单词翻译:单击)

听力文本

This quartz had a very strange set of parallel fracture-like fused planes, running through it at several angles.
这种石英中有非常奇怪的平行裂丝状结构,从各个角度贯穿晶体。
Something had shuttered the quartz.
看来有什么东西破坏了石英。
Retallack knew that only a force of enormous size could create these patterns.
Retallack很清楚只有强力冲击才会造成这种纹理。
It seemed there must have been a huge meteor.
看起来这必定是大型天体所为。
It looks as though he had found the traces everybody had been looking for.
他似乎已找到了所有人梦寐以求的线索。

BBC纪录片地平线《地球劫难日》

Yet again, something didn't fit.
可是新的问题又出现了。
As Retallack looked further at the new evidence, there was a surprise.
Retallack深入研究这些证据后有了惊人的发现。
The meteor that had wiped out the dinosaurs had left huge quantities of shattered quartz.
消灭恐龙的陨石留下了大量的破碎石英。
It had also left traces of a metal mainly found in outer space called iridium.
还带来了主要存在于外太空的金属元素,铱。
It's a common component of meteors.
陨石中通常都有这种成分。

视频及简介

如今,我们的世界生机盎然,随处可见活着的生灵。那么请想象一下所有这些生命有95%在一瞬间遭到了毁灭。这不是虚构的故事,它确实发生过。就在3亿年前的二迭纪,地球上还是一片丰饶繁荣的景象,然而2亿5千万年前的一场神秘事件导致了95%的物种灭绝,称为二迭纪生物大灭绝。这个凶残的杀手究竟是谁?是剧烈的地质运动、气候灾变,还是来自外太空的天体碰撞?为此,科学家们展开了一系列调查,试图解开“地球劫难日”惨剧背后的真相。


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