Objective To study the risk factors of cardiovascular diseases in the middle-elderly population and develop reasonable prevention strategies.

目的了解北京酒仙桥地区中老年人群心血管病发病的相关因素，以制定合理的预防措施。

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Parkinson disease (PD) is a common disease in the middle-aged and elderly population, which may affect their quality of life.

帕金森病(PD)是中老年人的常见病之一，严重危害中老年人的生活质量。

youdao

The study says the elderly are nine percent of the total population of low and middle income countries today.

VOA: special.2009.12.28