A new outbreak of smallpox occurred in 1928.

1928 年爆发了新一轮的天。

The smallpox vaccine has saved many lives.

天苗挽救了许多人的生命。

In 1742 he suffered a fatal attack of smallpox.

1742 年，他染上了致命的天。

Were you vaccinated against smallpox as a child?

你小时候打过天苗吗？

Smallpox can be contained by vaccination.

种苗可以控制住天。

Cases of smallpox are becoming rare.

天病例日益罕见。

Vaccination immunizes people against smallpox.

种能使人免患天。

Vaccination for smallpox is efficacious.

种防天是有效的。