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It seemed there was no role left for the asteroid impact or impacts at all.
看起來小行星碰撞或者所有碰撞均沒有產生任何影響。
The dinosaurs were doomed anyway:
恐龍命中注定是要滅絕的：
except there was still evidence of an environmental catastrophe at the KT boundary.
雖然第三紀界線層中依舊存在著環境災難證據。
The awkward unavoidable fact that remains to support the impact theory was the fern spike.
仍舊支持大碰撞理論的不可否認的事實就是蕨類植物。
The predominance of fern spores in the KT boundary layers suggests that all vegetation was destroyed for a time.
在第三紀界線層中，蕨類植物孢子高峰表明所有植物一度遭到過破壞。
Those who are convinced that Chicxulub killed off the dinosaurs argue that the fern spike, caused by the impact,
那些堅持認為希克蘇魯伯大碰撞消滅恐龍的科學家辯稱，由大碰撞引起的蕨類高峰，
is still the key to understanding the mass extinction.
仍然是大滅絕認識中的關鍵。
It's reasonable to think that all the standing vegetation all over the earth was destroyed,
認為地球上所有的常見植物都遭到過破壞，這是有道理的，
so we don't understand exactly how yet,
但我們并不了解具體情形，
but certainly its evidence of a dramatic catastrophe in the terrestrial eco system from the impact.
當然，這是大碰撞給陸地生態系統帶來巨大災難的證據。
Because the vegetation was not destroyed by wild fires,
既然植物不是被野火燒毀的，
the most likely cause seems to be global darkness brought on by the impact dust
那么摧毀它們的最有可能的原因就是由大碰撞煙塵所造成的全球黑暗，
and that would have been catastrophic for the dinosaurs.
這對恐龍來說也是致命的災難。
