;
;A new outbreak of smallpox occurred in 1928.
1928 年爆发了新一轮的
。
；牛痘；菌病
A new outbreak of smallpox occurred in 1928.
1928 年爆发了新一轮的。
The smallpox vaccine has saved many lives.
挽救了许多人的生命。
In 1742 he suffered a fatal attack of smallpox.
1742 年，他染上了致命的。
Were you vaccinated against smallpox as a child?
你小时候打过吗？
Smallpox can be contained by vaccination.
种牛痘可以控制住。
Cases of smallpox are becoming rare.
病例日益罕见。
Vaccination immunizes people against smallpox.
种牛痘能使人免患。
Vaccination for smallpox is efficacious.
种牛痘防是有效的。
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