English-Hanzi/Dementia is a broad category of brain diseases

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Dementia is a broad category of brain diseases that cause a long-term and often gradual decrease in the ability to think and remember that is severe enough to affect daily functioning.

痴呆症是一类广泛的脑部疾病,会导致思维能力和记忆力的长期下降,并且通常会逐渐下降,这种下降严重到足以影响日常功能。