1. Such changes are also indicators of economic dynamism and demographic expansion. 这些变化也是经济活跃和人口膨胀的指示器。
2. There are substantial differences among consumers with similar demographic characteristics. 具有相似人口统计学特征的消费者之间存在实质性差异。
3. By the mid-19th century most of Europe was in the first stage of the demographic transition. 到19世纪中叶，欧洲的大部分地区处于人口转变的第一阶段。
4. For example, the economic and demographic character of early New England towns varied considerably. 例如，早期新英格兰城镇的经济和人口特征差别很大。
5. Applying the most conservative estimates to current demographic trends, the human population will increase by about three billion people by then. 按照对目前人口趋势的最保守估计，到那时人口将增加约30亿人。
