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1 jan 1950 ano - 20C中叶 |欧美各国完成了农业机械化，建立起高度集约的现代农业 1950s |美国已经使用机械通风储粮技术 20C下半叶以来|西方发达国家的基础医学突飞猛进

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

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1 jan 1950 ano

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~ 75 years ago

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