老年痴呆 senile dementia
- 能够预防帕金森病和老年痴呆吗?
Can We Prevent Parkinson's and Alzheimer's Disease? - 老年痴呆症危害了全世界数百万人。
Alzheimer's disease affects millions of people around the world. - 那时几乎六分之一的人的了老年痴呆。
By that time, almost one out of six of them had dementia.
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