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About Alzheimer's Disease
關于阿爾茨海默氏病
Dementia is a brain disorder that seriously affects a person's ability to carry out daily activities.
癡呆是一種大腦功能性失調，嚴重時會影響一個人的日常生活能力。
The most common form of dementia among older people is Alzheimer's disease (AD),which involves the parts of the brain that control thought, memory, and language.
老年人最常見的癡呆病是阿爾茨海默病(AD)，它牽扯到大腦中管理思想，記憶和語言的部位。
Scientists think that as many as 4.5 million Americans suffer from AD.
科學家認為有450萬美國人患有這種癡呆病。
The disease usually begins after age 60, and risk goes up with age.
該病一般發病于60歲之后，發病的風險也會隨著年齡的增加而增加。
AD is named after Dr. Alois Alzheimer, a German doctor. In 1906,
該病用一個德國醫生，阿爾茨海默醫生的名字來命名。1906年，
Dr. Alzheimer noticed changes in the brain tissue of a woman who had died of an unusual mental illness.
阿爾茨海默發現了一位死于不常見精神病的女患者的腦組織發生變化。
He found abnormal clumps. Scientists also have found other brain changes in people with AD.
他發現了異常凝結。科學家還發現了患有該病的患者腦部的變化。
Nerve cells die in areas of the brain that are vital to memory and other mental abilities.
大腦中與記憶力和其他心理能力有關的部位里的神經細胞都死了。
Scientists do not yet fully understand what causes AD.
科學家還不能全面解釋導致這種癡呆癥的原因。
Age is the most important known risk factor for AD. Family history is another risk factor.
年齡是造成阿爾茨海默病最重要的一個已知因素。
Scientists believe that genetics may play a role in many AD cases.
研究者認為遺傳可能是導致該病的一大原因。
Scientists still need to learn more about what causes AD. In addition to genetics, they are studying education, diet, and environment to learn what role they might play in the development of this disease.
科學家仍然需要懂得更多關于導致該病的原因。再者，在遺傳學的角度上，他們正研究著教育、飲食和環境對于該病發生過程中的所能引起的影響。
