Europe is the greyest continent, with 23 of the world's 25 oldest countries.

欧洲是老龄化最严重的大陆，世界上25个老龄化最严重的国家中有23个就在欧洲。

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Europe is the greyest continent, with 23 of the world's 25 oldest countries.

欧洲是老龄化最严重的大陆，世界上25个老龄化最严重的国家中有23个就在欧洲。

youdao