herd immunity
noun/ˌhɜːd ɪˈmjuːnəti/
/ˌhɜːrd ɪˈmjuːnəti/
[uncountable]- protection from a disease that happens if a large percentage of the population is immune to it (= unable to catch it, for example because they have been vaccinated)
如果大部分人口对某种疾病具有免疫力（=无法感染该疾病，例如因为已经接种了疫苗），则可以预防该疾病 - Herd immunity can be achieved if 95% of children are vaccinated.
如果95%的儿童接种疫苗，就可以实现群体免疫。
- Herd immunity can be achieved if 95% of children are vaccinated.