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1·Smallpox inoculation or variolation is a great invention of medicine in ancient China.

人痘接种预防天花是中国古代医学家的伟大发明。

2·Abstract: Smallpox inoculation or variolation is a great invention of medicine in ancient China.

文摘：人痘接种预防天花是中国古代医学家的伟大发明。

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

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。