接种疫苗疗法

例句：

1. 1. The vaccine is effective against the virus.
   这种疫苗对病毒有效。
2. 2. Vaccines are used to protect people from diseases.
   疫苗用于保护人们免受疾病侵害。
3. 3. The government has approved a new vaccine for children.
   政府已批准一种新疫苗供儿童使用。