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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。
youdao
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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。
youdao