所有儿童都接种了脑膜炎疫苗。

All the children are given a meningitis ___vaccination.

得益于疫苗接种，发展中国家的公共卫生显著改善。

Thanks to ___vaccination, public health has improved significantly in developing countries.

广泛的疫苗接种使人们能够活得更长久、更健康。

Widespread ___vaccination has enabled people to live longer and healthier lives.