【摘 要】
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The Four Great InventionsDuring the Song period the Chinese people further developedthe making of the compass,paper,and gunpowder,and the art ofprinting.Togeth
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The Four Great InventionsDuring the Song period the Chinese people further developedthe making of the compass,paper,and gunpowder,and the art ofprinting.Together,they are called the four great inventions thatChina contributed to the world.As early as the Warring States period the magnetic force ofmagnetite was discovered,and a sort of instrument was made of
The Four Great InventionsDuring the Song period the Chinese people further developed the making of the compass, paper, and gunpowder, and the art ofprinting.Together, they are the four great inventions thatChina contributed to the world. As early as the Warring States period the magnetic force ofmagnetite was discovered, and a sort of instrument was made of
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