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在流行病学研究中常常要用到人口学资料，尤其是当研究遭受自然灾害后某地区人群的卫生问题时，人口学数据就显得十分重要和必要。一般情况下受灾地区的范围相对地比较小，通常为数个区县乃至数个省，所以当我们研究一个或几个区县这样的小区域人群（十万至数十万人口）时，能
Demographic data is often used in epidemiological studies. Demographic data, in particular, is important and necessary when studying the health problems of people in a certain area after a natural disaster. In general, the affected areas are relatively small, usually in counties or even in several provinces. Therefore, when we study the small-area population (100,000 to hundreds of thousands of people) in one or several districts and counties, we can