And that's what I'm going to show you, because since 1960 what has happened in the world up to 2010 is that a staggering four billion people have been added to the world population.
这就是我将要向你们展示的。 因为自从1960年 到2010年间，所发生的是 一个惊人 的四十亿人口 加入到了世界人口中。