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。