In years gone by, many children were afflicted with polio, measles, mumps, Rubella, influenza, small pox, diphtheria, whooping cough and others.
在过去的岁月中，许多儿童患有小儿麻痹症，麻疹，腮腺炎，风疹，流感，天花，白喉，百日咳和其他疾病。
Viruses cause many common diseases, including mumps, measles, small pox, chicken pox, and influenza.
病毒造成多种常见疾病。包括流行性腮腺炎，麻疹，天花，水痘和流感。
Viruses cause many common diseases, including mumps, measles, small pox, chicken pox, and influenza.
病毒造成多种常见疾病。包括流行性腮腺炎，麻疹，天花，水痘和流感。
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