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Zhang Haidi talked about his experience of self-learning English and
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来新夏
Chronology, a relatively special genre of biography in historical bo
李知宴
As early as the Neolithic Age, our ancestors invented pottery, and t
郭书春
Mathematics is one of the most developed basic scientific discipline
李根蟠
China is one of the origin centers of world agriculture.Chinese agri
王仁湘
"Prehistoric" specifically refers to the entire human hist
郭彦岗
China is one of the first countries in the world to use currency. Si