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。
The abstract shall state briefly the main technical points of the invention or utility model.
摘要应当简要说明发明或者实用新型的技术要点。
This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
该摘要应认为是为在具体的领域中检索的目的而使用的搜索工具，而不是想要限制本发明。
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