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我是一名退休老人,儿女早已成家,老伴在几年前也已去世,最近一段时间,我总感觉记忆力下降,而且做什么事都提不起兴趣来,请问我这是怎么了?——马先生
I am a retired man. My children have long been married. My wife died a few years ago. Recently, I always feel memory loss, and do nothing to mention interest. May I ask what happened? - Mr. Ma