The smallpox vaccine has saved many lives.
天挽救了许多
命。
The smallpox vaccine has saved many lives.
天挽救了许多
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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