在中国北京城乡交界的一个地铁站（龙泽站），人们排着队准备搭乘地铁上班。
Longze underground station on the outskirts of Beijing, people queuing up to take the underground to work.
目的：描述1984—1999年北京城乡人群心血管病主要危险因素的流行状况，对比并评价心血管病危险因素的变化趋势。
Objective: to describe the distribution of major cardiovascular diseases (CVD) risk factors and to analyze their trends in urban and rural populations of Beijing from 1984 to 1999.
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