接种人痘，是直接使用小量的天花，和金纳后来用牛痘接种不同。

Unlike Jenner's later vaccination, which used cowpox, variolation used a small measure of smallpox itself.

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一位英国医生爱德华•琴纳(Edward Jenner)，发现通过接种感染牛痘脓疱可以预防天花。

An English physician, Edward Jenner, discovered that by inoculating a person with pustules from the pox infection of a cow, smallpox could be prevented.

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接种牛痘能使人免患天花。

Vaccination immunizes one against smallpox.

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And he kept track of how many people he gave the vaccines to, and then he kept track of what would happen to those people when a smallpox infection occurred in their community.

他与接种过牛痘的人保持联系,关注当天花在这些人周围肆虐时,他们身上发生了什么

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