求翻译：There now are about 4 billion of us on earth. That could reach 6 billion by the end of the century and 11 billion in a further 75 years.是什么意思？

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There now are about 4 billion of us on earth. That could reach 6 billion by the end of the century and 11 billion in a further 75 years.

问题补充：

匿名	2013-05-23 12:26:38 现在就是我们在地球上约有 4 亿。可能达到 6 亿到世纪末和进一步的 75 年 11 亿元。

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