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jan 1, 1796 - 18C晚期 （英）詹纳发明牛痘接种法

Description:

#1796

使天花的发病率大大降低

Added to timeline:

人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

ByGUZI
8 months ago
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3481

Date:

jan 1, 1796
Now
~ 229 years ago
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