If we do have longevity, then we'll have to face the population growth problem anyway. Because if people live 200 or 1,000 years, then we can't let them have a child more than about once every 200 or 1,000 years.
如果我们人人都很长寿，我们必须要面对人口的增加 的问题。因为如果我们活个200年或1000年， 我们不能让他们每隔200或是1000年生一次小孩。