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Earth has benefited from all of these.
地球擁有一切條件
An environment that remains relatively stable
一個相對穩定的環境
for complex life to survive.But there's a curious twist.
是復雜生命存活的關鍵 但是還有一個特別的曲折
Too much stability and evolution can get stuck in a bit of a rut.
太多的穩定和進化會造成重蹈覆轍
Every now and then life needs a catastrophe to shake things up.
時不時地生命需要災難來改變現在
In the jungles of Mexico lies the evidence of one such catastrophe,
在墨西哥的一個叢林里 就有證據證明這樣災難的存在
one that turned out to be very important for us humans.
這次災難對于人類來說非常重要
You know, everywhere you go around here, you find these holes.
不管你走到哪里都能發現這樣的坑
They're called cenotes.
他們被稱作沼穴
There's thousands of them and most of them haven't even been explored.
有好幾千個 大部分都還沒有被探索
But these are the right people to be with because these guys are cave explorers
這些人正是我們需要的 因為他們就是沼穴探索者
and they're going to show me a new world.one beneath our feet.
它們要為我們打開一個新的世界 就在我們腳下
Team leader Bernadette is the first to descend.
小組領隊伯納德特第一個下去
