You see, there's two forks in the road. We know that people live twice as long as chimpanzees almost, and nobody lives more than 120 years, for reasons that aren't very well understood.
你看，那里有两条叉路。我们知道大部分人类活的 寿命是黑猩猩的两倍， 而且没有人活超过120年的寿命， 具体的原因我们并不是很了解