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近三十年来,世界上老人的比例增加了,老年医学也随之发展起来。从生理角度,一般把人的一生分为成长期(20岁以前),成熟期(20～40岁)、
In the past three decades, the proportion of the elderly in the world has increased, and geriatrics has also developed. From the physiological point of view, the general human life into growth period (20 years ago), maturity (20 to 40 years old)