这千真万确的人口增长率下降现象不只发生在巴西。
That new Brazilian fertility rate is below the level at which a population replaces itself.
但当工具的使用所产生的新动力被充分利用以后，世界人口增长率下降并且趋于稳定。
But when the new power from the use of tools has been exploited, the rate of world population growth fell and became almost stable.
人口增长率一直在步步下降。
The rate of population increase has been ratcheting downward.
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