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They're one of the planet's most successful species.
它們是地球上最成功的物種之一，
They've survived volcanic eruptions, earthquakes, and entire continents splitting apart.
它們在火山爆發、地震和整個大陸分裂過程中幸存了下來。
The dinosaurs have thrived for 165 million years.
恐龍已經繁盛了1億6500萬年。
A number of mammals have also survived, like this shrew-like animal.
許多哺乳動物也存活了下來，比如這種像鼩鼱一樣的動物。
They're prey to the dinosaurs.
它們是恐龍的獵物。
So they live in trees or underground, and venture out only at night.
所以他們住在樹上或地下，只在晚上外出。
Mammals pose no threat to the dinosaurs.
哺乳動物對恐龍構不成絲毫威脅。
Nothing on Earth can challenge their dominance.
地球上沒什么能挑戰他們的統治地位。
Nothing, on Earth.
地球上沒有。
A large piece of space rock, heads toward Earth.
一塊巨大的太空巖石，朝向地球飛來。
This asteroid is at least 6 miles across, and travelling over 40,000 miles an hour.
這顆小行星直徑約10公里，時速超過64000公里。
It's bigger than Mount Everest, and heads straight for the Gulf of Mexico.
它比珠穆朗瑪峰還大，直接向墨西哥灣進發。
