几万年前，全球人口基数很小，所以很长时间以来每一代人哺育的孩子很少。
The worldwide human population was tiny until a few thousand years ago, and people have few children with long periods between each generation.
直到几千年前，全世界的人口还是微不足道，而且在每一代人之间，人们要长时间才有几个孩子。
Because evolution is a Numbers game.The worldwide human population was tiny until a few thousand years ago, and people have few children with long periods between each generation.
在重写产品代码的时候，我们用了同样的办法：在几周的时间里，每碰到一点代码，就重写一点。
We took the same approach when converting the main code: over a number of weeks, as we touched a bit of code, we converted it.
而且像人一样，它们也开始用“第几代”来描述，并且每一代之间的时间间隔越来越小。
They were thought of, like people, in terms of generations, with the distance between generations much smaller.
而且像人一样，它们也开始用“第几代”来描述，并且每一代之间的时间间隔越来越小。
They were thought of, like people, in terms of generations, with the distance between generations much smaller.
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