gerontology
gerontology[ˌdʒɛrənˈtɒlədʒi]noun- [mass noun]the scientific study of old age, the process of ageing, and the particular problems of old people
老年学,老人学,老年病学
派生gerontologicaladjectivegerontologistnoun语源- early 20th cent.: from Greek gerōn, geront- 'old man' + -logy
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