我朋友们的父母有一半是老年痴呆。
病人经常患有被认为是老年痴呆症症状的脑部炎症。
Patients often suffer inflammation of the brain, an effect that was thought to be a symptom of the disease.
我国老年人口逐渐增加，相应的老年痴呆的发病率也随之增加，而认知功能下降是老年痴呆的重要因素。
With the increase in the number of aged people, the incidence of senile dementia raises correspondingly. Decline of cognition ability is a key factor leading to dementia in the elderly.
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