1. 2)since prevalence rates are high among the homosexual population,the chances of engaging in sexual relations with an infected person are much,much higher than in the general population. 
   第二，由于同性恋者的感染率高，因此，他们同被感染的人发生性关系感染的机会也大大高于一般人。
2. 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。
3. 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.
4. 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。
5. The prevalence of such values has made boosting the national birthrate seem an unachievable goal. 
   也正因为这种价值观念，使得人口增长成了一个遥不可及的目标。

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