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Ageing populations will add further momentum to that growth .

老龄化人口则会进一步推动这种趋势。

Aging populations also play a part .

人口老化也起一定的作用。

Most rich countries have rapidly ageing populations .

多数富裕国家拥有快速老龄化的人口。

Populations are also being diverted .

不少人口也已被迁移。

How long do countries have until their populations disappear ?

各个国家的人口还需多久面临灭绝？