1. Vaccination for smallpox is efficacious.
   种牛痘防天花是有效的。
2. Smallpox can be contained by vaccination.
   种牛痘疫苗可以控制住天花。
3. A new outbreak of smallpox occurred in 1928.
   1928 年爆发了新一轮的天花。
4. Were you vaccinated against smallpox as a child?
   你小时候打过天花疫苗吗？
5. The smallpox vaccine has saved many lives.
   天花疫苗挽救了许多人的生命。
6. Cases of smallpox are becoming rare.
   天花病例日益罕见。
7. In 1742 he suffered a fatal attack of smallpox.
   1742 年，他染上了致命的天花。The smallpox vaccine has saved many lives.
   天花疫苗挽救了许多人的生命。
8. Were you vaccinated against smallpox as a child?
   你小时候打过天花疫苗吗？
9. A new outbreak of smallpox occurred in 1928.
   1928 年爆发了新一轮的天花。
10. In 1742 he suffered a fatal attack of smallpox.
    1742 年，他染上了致命的天花。
11. Smallpox can be contained by vaccination.
    种牛痘疫苗可以控制住天花。
12. Cases of smallpox are becoming rare.
    天花病例日益罕见。
13. Vaccination immunizes people against smallpox.
    种牛痘能使人免患天花。
14. Vaccination for smallpox is efficacious.
    种牛痘防天花是有效的。

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