By 2050, the population of Africa is expected to reach 1.8 billion, 0.9 billion more than its current population.

到2050年，非洲总人口将达到18亿，比目前多9亿。

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The current population of around 20.4 million is concentrated mainly in the large coastal cities of Sydney, Melbourne, Brisbane, Perth and Adelaide.

澳大利亚大约2040万的人口聚集在沿海城市，包括悉尼（Sydney）、墨尔本（Melbourne）、布里斯班（Brisbane）、珀斯（Perth）和阿德来得（Adelaide）。

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Researchers have long known that modern humans lack the genetic variation found in other living primates, such as chimpanzees or gorillas, even though our current population size is so much larger.

科学家以前就知道，虽然我们人口众多，但现代人不像其它现存的灵长类动物（比如黑猩猩和大猩猩）有那么多遗传变异。

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But counting the world's third largest population -- about three hundred nine million by current estimates -- is no easy job.

VOA: special.2010.03.20

The census figures are based on the Current Population Survey as of November 2012.

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The current population of 7 billion is expected to increase to 9 billion within three decades.

CNN: STORY HIGHLIGHTS

The study used data from the Current Population Survey from 2003 to 2011.

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