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This little tree frog, like all amphibians, is very susceptible to acid rain.
這種小樹蛙和所有的兩棲動物一樣，很容易受到酸雨的影響。
They have problems with their metabolism and finally they can't breed in the water.
它們的新陳代謝會出現問題，以至于最后不能在水中繁殖。
If acid rain had occurred at the end of the Cretaceous, all amphibians should have disappeared.
如果酸雨出現在白堊紀晚期，那所有的兩棲動物都應該消失。
They don't, almost all of them survived,
但是它們沒有，它們幾乎都還活著，
as do all the turtles, the crocodiles, their cousins the alligators and most fishes.
所有的海龜、鱷魚和它們的近親短吻鱷，還有大多數魚類也都活著。
This says that there can not have been battery acid strength acid rain at the end of the Cretaceous.
這就說明在白堊紀晚期沒有出現像電池酸那樣強的酸雨。
If there was no significant acid rain, it seemed another killing mechanism had been disproved.
如果至關重要的酸雨不存在，那么另一種引起大滅絕的事件也將難以立足。
And what about the so called impact winter?
那就是所謂的碰撞冬天。
Dust was meant to have blocked out the sun...
煙灰封住了太陽，
that could have plunged the world into deep freeze for months or years, but again those little frogs got in the way.
這種情況會使全世界陷入數月甚至數年的冰冷之中，但是這些存活下來的小青蛙又如何解釋呢。
Amphibians like all cold blooded creatures have problems dealing with sudden drops in temperature,
像所有的冷血動物一樣，兩棲動物無法應對氣溫突然下降的情況，
especially if it lasts for many months or years.
特別是它會持續幾個月甚至幾年。
If this had happened at the end of the Cretaceous,
要是這樣的情況出現在白堊紀晚期，
then many cold blooded organisms should have become extinct, but they did not.
那么許多冷血動物就應該消失，但是它們沒有。
This tells us that there could not have been a long term drop in temperature.
這就告訴我們，地球歷史上并沒有發生過長時間的降溫。
