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Languages have been coming and going for thousands of years，but in recent times there has been less coming and a lot more going.When the world was still populated by hunter-gatherers，small，tightly knit(联系) groups developed their own patterns of speech independent of each other.Some language experts believe that 10,000 years ago，when the world had just five to ten million people，they spoke perhaps 12,000 languages between them.
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