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So the dinosaurs did not freeze to death...
由此可見，恐龍不是凍死的，
nor did they roast and nor did they die from the effects of acid rain.
它們既不是死于大火，也不是死于酸雨的影響。
There seemed to be so many holes in the impact theory,
看起來大碰撞理論中存在著許多漏洞，
scientists began to dust down a more classical, evolutionary idea.
科學家們開始探尋一種更具說服力、更符合進化的觀點。
Maybe the dinosaurs had died out gradually and for completely different reasons.
也許恐龍是由于完全不同的原因而慢慢滅絕的。
Many scientists believe that about ten million years before the KT boundary,
許多科學家認為，在第三紀界線前大約1000萬年，
the dinosaurs' environment began to get markedly worse.
恐龍的生存環境開始顯著惡化。
The lush coastal planes on which they depended began to turn arid, as sea levels fell dramatically.
隨著海平面的急劇下降，它們賴以為生的沿海植物開始變得匱乏。
Their natural habitat was disappearing.
它們的自然棲息地消失了。
They no longer have as much area to live in, they don't have as much food to eat,
它們不再有足夠多的生存空間和足夠多的食物，
it's harder to get from one area to another.
在不同地域間遷徙變得更加艱難。
Organisms are adapted for a certain type of environment and when those conditions disappear, those organisms disappear.
生物都得適應某種環境，每當生存環境消失，這些生物也會消失。
