The world's population was about 6.5 billion in 2008.下文是什么?

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The world's population was about 6.5 billion in 2008.下文是什么?

The world's population was about 6.5 billion in 2008.下文是什么?
The world's population was about 6.5 billion in 2008.下文是什么?

The world's population was about 6.5 billion in 2008.下文是什么?
over three billion people live in Asia now.That's about half of the world‘s population.