;A new outbreak of smallpox occurred in 1928.
1928 年
新一轮的天
。
疫苗；牛
苗；天菌苗病毒A new outbreak of smallpox occurred in 1928.
1928 年新一轮的天。
The smallpox vaccine has saved many lives.
天疫苗挽救许多人的生命。
In 1742 he suffered a fatal attack of smallpox.
1742 年，他染上致命的天。
Were you vaccinated against smallpox as a child?
你小时候打过天疫苗吗？
Smallpox can be contained by vaccination.
种牛疫苗可以控制住天。
Cases of smallpox are becoming rare.
天病例日益罕见。
Vaccination immunizes people against smallpox.
种牛能使人免患天。
Vaccination for smallpox is efficacious.
种牛防天是有效的。
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