;
，The smallpox vaccine has saved many lives.
天
疫
挽救了许
生命。
疫；牛痘；天菌病毒The smallpox vaccine has saved many lives.
天疫挽救了许生命。
A new outbreak of smallpox occurred in 1928.
1928 年爆发了新一轮天。
Were you vaccinated against smallpox as a child?
你小时候打过天疫吗？
In 1742 he suffered a fatal attack of smallpox.
1742 年，他染上了致命天。
Smallpox can be contained by vaccination.
种牛痘疫可以控制住天。
Cases of smallpox are becoming rare.
天病例日益罕见。
Vaccination immunizes people against smallpox.
种牛痘能使免患天。
Vaccination for smallpox is efficacious.
种牛痘防天是有效。
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