How many?

有多少
A lot.

非常多
How many?

具体多少
Well, I once tried to calculate.

我曾经计算过这个数量
Well, as you'll see,

大家知道
the calculation is utterly off the back of the envelope,

这种估算不是一页纸就能做完的
sort of rough and completely inadequate in ways that I'll point out.

得到的结果只是粗略的
But at least it'll give you a sense of

但起码可以让你们有个概念
just how many potential people there are.

知道会有多少潜在的人类
Let's start modestly and ask:

先做一个保守估计
How many possible people could we,

我们这一代人
the current generation, produce?

可以制造多少人类