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