璐璐小花猫
幼苗
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I have the theme of China's four great inventions.China's four great inventions of the world well-known,the difference lies on the compass,gunpowder,moveable type,paper-making technique.
In the history of human civilization,occupies an important position.Compass was first generated in Warring States period,called Sinan.At that time,mainly used for navigation.
Powder is mainly used by saltpeter,sulfur and charcoal made from mixing these three substances,the beginning of the Tang Dynasty,mainly for military gunpowder.
The invention of paper,the Chinese nation is the world's outstanding contribution to one of civilization.The early years of the Western Han Dynasty,Cai Lun sum in Manufacturing predecessors silk crystal on the basis of experience,invented by the bark,broken fishing net,rag,Ma as a first-class raw materials,manufacturing has become to write for the paper plant fiber,so that the only paper It has become widely used writing material.
It was the beginning of moveable type printing in the printing of the Sui Dynasty,Song Ren Bi Sheng at the time of development and improvement of moveable type produced by the Mongols spread to Europe,so called after the completion of printing promoted to the ancestor.
在网上找个软件翻译就好了啊
1年前
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