不能约
发表于 2025-4-1 02:56:41
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用不完
发表于 2025-4-1 08:14:13
https://doi.org/10.1007/978-3-662-38097-0ll account for about 10% of the world’s population in the year 2000 . At that time at the latest, the problems of medical care in old age will also become evident for some currently developing countries . The proportion of people in old age as related to total population increases primarily b