四大发明
四大发明是中国古代四项具有世界影响力的科技发明，分别是造纸术、印刷术、指南针和火药。中国汉代的造纸术从8世纪开始便传入中亚、西亚和欧洲，为人类提供了经济、便利的书写材料，掀起一场人类文字载体革命。中国发明活字印刷术后，欧洲人也发明了活字印刷机，这些技术为书籍出版和普及奠定了基础，大大促进了文化传播，直接推动了欧洲文艺复兴和宗教改革。指南针和火药在13世纪传入欧洲，指南针为欧洲航海家的航海活动提供了技术条件， 直接推动了大航海时代的开启；火药武器的使用改变了作战方式，加速了西欧封建时代的终结。
四大发明推动了中国古代的政治、经济、文化和社会发展，其经各种途径传至西方，为人类文明进步作出巨大贡献。
The Four Great Inventions of Ancient China
The four great inventions of ancient China refer to papermaking, printing, gunpowder, and the compass. They exerted far-reaching impact on the world. In the 8th century, Chinese papermaking technology, which was invented during the earlier Han Dynasty, was introduced to Central Asia, West Asia, and Europe, setting off a writing revolution by providing economical and convenient writing materials for humans. After the invention of printing by the Chinese, Europeans invented the movable-type printing press. These technologies paved the way for the publication and popularization of books, greatly facilitated cultural communication, and provided impetus for the Renaissance and the Reformation in Europe. The compass and gunpowder were introduced to Europe in the 13th century. The compass offered technical assistance to the European navigators, ushering in the Age of Discovery. Gunpowder weapons changed methods of warfare, accelerating the demise of the feudal system in Western Europe.
The four great inventions promoted political, economic, cultural, and social progress in ancient China. After they were introduced to the West through various channels, they contributed greatly to wider human advancement.
