日期：
来源：雅诚德英语网
"It really raises the question of what should be considered normal ageing," says Kenneth Manton, a demographer from Duke University in North Carolina.
北卡罗来纳州杜克大学人口统计学家肯尼斯·曼顿说：“这确实引发了一个问题，即什么是正常的老龄化。”
"It really raises the question of what should be considered normal ageing," says Kenneth Manton, a demographer from Duke University in North Carolina.
北卡罗来纳州杜克大学人口统计学家肯尼斯·曼顿说：“这确实引发了一个问题，即什么是正常的老龄化。”