univalent vaccine

例句：

1. 1. The monovalent vaccine is effective against the virus.
   这种单价疫苗对病毒有效。
2. 2. The monovalent vaccine was developed to protect people from the disease.
   这种单价疫苗被开发出来以保护人们免受这种疾病的侵害。
3. 3.The monovalent vaccine has been shown to be safe and effective in clinical trials.
   在临床试验中，这种单价疫苗已被证明是安全且有效的。