If the rate of population growth of the United States between 1820 and 1850 had sustained over time, we'd have today approximately one and a half billion people in the United States.
如果在1820至1850年间,美国人口增长率保持下去的话,今天我们的美国,就会拥有近十五亿人口
If the rate of growth had sustained, that's what the population would've been.
假如高增长率持续的话,我们现在得有多少人口啊
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