The Chinese practice of variolation must have made little sense to 18th-century Englanders. It involved giving children small scratches and then rubbing the broken skin with powder ground from smallpox scabs.
18世纪的英格兰人一定不能理解manbetx3.0 的人痘接种法：把受种儿童的皮肤划破一小块，然后把天花患者痘痂所制粉末擦在皮肤破损处。
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