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造纸、印刷术、指南针和火药是举世闻名的中国古代四大发明,在交通和信息不发达的时代,它们是怎样被传播到域外,又是怎样改变世界的发展进程的呢?
Paper making, printing, compass and gunpowder are the four most famous ancient Chinese inventions. In the era of underdeveloped transportation and information, how are they spread outside the domain and how do they change the course of the world?