2) activity theory of aging
老年活动论
3) Theoretical Old Support Ratio
理论老年抚养比
4) disengagement theory of aging
老年减少参与论
5) On the Health Care of Middle-aged and Senior Citizens
试论中老年养生
6) Discussion on Packing of Product for the Old
论老年产品包装
补充资料:抚养比
见人口年龄结构。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条