cross inoculating

例句：

1. 1. The researchers performed a cross-inoculation experiment to study the effects of different vaccines on the immune system.
   研究人员进行了交叉接种实验，以研究不同疫苗对免疫系统的影响。
2. 2.During the pandemic, doctors and nurses were required to perform cross-inoculation to prevent the spread of the virus.
   在疫情期间，医生和护士被要求进行交叉接种，以防止病毒的传播。
3. 3. The government has announced plans to introduce cross-inoculation for children aged 12 and above toboost their immunity against COVID-19.
   政府已宣布计划为12岁及以上的儿童引入交叉接种，以提高他们对COVID-19的免疫力。