Alzheimer's disease is a severe neurodegenerative disorder of the brain that is characterized by loss of memory and cognitive decline.

老年痴呆症是一种十分严重的大脑神经变性失调症，其特点是记忆丧失和认知衰退。

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Alzheimer disease (AD), the most common cause of dementia in the elderly, is a progressive neurodegenerative disorder that gradually robs the patient of cognitive function and eventually causes death.

阿尔茨海默病是一种以渐进性的认知功能障碍为主要特征的神经退行性疾病，该病最终会导致死亡，是痴呆病中最常见的一种类型。

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