if you look at the population curve, you find the population of humans on the earth more than doubles and we're up three-and-a-half times since I was born. When you have a new baby, by the time that kid gets out of high school more people will be added than existed on earth when I was born.
如果你看一下这条人口曲线，你可以发现地球的人口数 已经增加了不止一倍，自从我出生以来，我们已经是 原来的3.5倍了。当你有一个初生儿， 到孩子高中毕业的时候 增加的人口数要比我出生时的总人口还要多--