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They're one of the planet's most successful species.
它们是地球上最成功的物种之一，
They've survived volcanic eruptions, earthquakes, and entire continents splitting apart.
它们在火山爆发、地震和整个大陆分裂过程中幸存了下来。
The dinosaurs have thrived for 165 million years.
恐龙已经繁盛了1亿6500万年。
A number of mammals have also survived, like this shrew-like animal.
许多哺乳动物也存活了下来，比如这种像鼩鼱一样的动物。
They're prey to the dinosaurs.
它们是恐龙的猎物。
So they live in trees or underground, and venture out only at night.
所以他们住在树上或地下，只在晚上外出。
Mammals pose no threat to the dinosaurs.
哺乳动物对恐龙构不成丝毫威胁。
Nothing on Earth can challenge their dominance.
地球上没什么能挑战他们的统治地位。
Nothing, on Earth.
地球上没有。
A large piece of space rock, heads toward Earth.
一块巨大的太空岩石，朝向地球飞来。
This asteroid is at least 6 miles across, and travelling over 40,000 miles an hour.
这颗小行星直径约10公里，时速超过64000公里。
It's bigger than Mount Everest, and heads straight for the Gulf of Mexico.
它比珠穆朗玛峰还大，直接向墨西哥湾进发。
