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1 Jan 1796 Jahr - 18C晚期（英）詹纳发明牛痘接种法

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#1796

使天花的发病率大大降低

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

29 Sep 2024

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1 Jan 1796 Jahr

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~ 229 years ago

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