Vaccination immunizes one against smallpox.接种牛痘能使人免患天花.Vaccination and other prophylactic measures can be carried out.可以采取疫苗接种和其他预防措施。Smallpox can be contained by vaccination.种牛痘疫苗可以控制住天花.Researchers continued to study t...
Vaccination and other prophylactic measures can be carried out.可以采取疫苗接种和其他预防措施。Anyone who wants to avoid the flu should consider getting a vaccination.如果不想得流感，就该考虑接种疫苗。Smallpox can be contained by vaccination.种牛痘疫苗可以控制住天...