分级时效;
Alzheimer's disease ( AD) is one of the most severe and most common progressive neurodegenerative diseases of aging.
阿尔兹海默病(Alzheimer'S Disease,AD)是现代社会中最常见的老年性中枢神经系统疾病之一。
Phased aging and progressive accommodation in term of time;
在时间上具有阶段性和累进的性质;
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