老人学 lǎorénxué gerontology Definitions Defs Origin Strokes Stroke Words Sentences Sents 老人学 老人學 lǎorénxué gerontology The scientific study of old age, the process of aging, and the social and psychological issues faced by the elderly
老人学 老人學 lǎorénxué gerontology The scientific study of old age, the process of aging, and the social and psychological issues faced by the elderly
