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。
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。
Germany's population is ageing, and the birth rate falling.
德国的人口老化，出生率下降。
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