In addition to Jenner, there was a farmer named Benjamin Jesty, who recognized that farmers, being in contact with cows, didn't get disease as often as non-farmers did.

除了詹纳,还有个叫本杰明?加斯特的农民,他发现与奶牛接触的农民,不像其他人那样容易患天花

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You were going to be giving away cows, did you do that?

你们不是打算送农民奶牛的么,送了吗

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Right. So, he took fluid from a cowpox lesion on a cow, and he injected it into his children and his wife, reasoning that this would protect them from disease, even though they didn't have as much contact with cows as farmers did.

就是这样,他从奶牛身上的,天花瘢痕中取出液体,将之注入他的妻儿体内,认为这样可以保护他们不得天花,即使他们并不像农民一样时时与奶牛接触

耶鲁公开课 - 生物医学工程探索课程节选