One group working to end smallpox in Afghanistan were variolators, people who aimed to deliver smallpox immunity through " variolation."

在阿富汗致力于消灭天花的一个团体是天花疫苗接种者，他们的目标是通过“天花接种”来提供天花免疫。

Variolation could lead to uncontrolled epidemics.

人痘可能导致不受控制的流行病。

A precursor to vaccination as we know it today, variolation involves grafting smallpox scabs onto healthy people to give them a milder version of the disease, with the hopes they'd be immune afterwards.

天花接种是我们今天所知的疫苗接种的前身，它涉及到将天花痂移植到健康人身上，给他们一种较温和的天花病毒，希望他们在接种后能够免疫。