四价

例句：

1. 1. The quadruple vaccine is highly effective against the common cold and flu.
   四价疫苗对普通感冒和流感具有很高的有效性。
2. 2. The quadruple vaccine has been shown to reduce the risk of severe illness in children.
   四价疫苗已被证明可以降低儿童患重症疾病的风险。
3. 3. The quadruple vaccine is recommended for children under five years old due to its high efficacy rate.
   四价疫苗因其高有效性推荐给五岁以下的儿童使用。