1. The contraceptive prevalence rate of married women of childbearing age reached 83%, and the average family size has decreased from 4.84 members in 1971 to 3.63 members in 1998. 
   平均家庭规模从１９７１年的４.８４人减少到１９９８年的３.６３人。
2. The first marriage age for women of childbearing age averaged 23.57 years in 1998, as against 20.8 years in 1970. The contraceptive prevalence rate of married women of childbearing age reached 83%. 
   育龄妇女平均初婚年龄从1970年的20.8岁提高到1998年的23.57岁，已婚育龄妇女综合避孕率达到83%。
3. the prevalence of dysentery is horrible. 
   流行性腮腺炎是腮腺炎病毒引起的呼吸道传染病。
4. They were very surprised by the prevalence of antigovernment sentiments. 
   他们对普遍存在的反政府情绪感到很吃惊.
5. The prevalence of cigarette smoking was much higher in lower social groups. 
   吸烟在低层社会群体中更为盛行。

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