A rapidly ageing population in many countries is also a contributing factor.
许多国家人口迅速老龄化也是一个促进因素。
Germany's population is ageing, and the birth rate falling.
德国的人口老化，出生率下降。
Population ageing is one of the most important problems is the world.
人口老化是当今世界最重要的问题之一。
Population ageing is one of the most important problems is the world.
人口老化是当今世界最重要的问题之一。
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