Therefore,the prolong of human average life makes it more obvious that AD do more harm to human health.It has been one of the most serious problems of geratology.

• 其患病率随年龄增长而上升，因此，随着人类平均寿命延长和人口老龄化的出现，AD对人类健康的危害变得日益突出，已成为当前老年医学面临的最为严峻的问题之一。