中国四大发明英文介绍 PPT课件.ppt

China Ancient Four Inventions 中国四大发明
Compass, gunpowder, papermaking skill and typography, is China ancient four inventions, it is one of the signs that China e to the ancient civilized country, occupy the important position in the history of human civilization.
罗盘、***、造纸术和印刷术,是中国古代四大发明, 这是中国成为这古老文明的国家,占据在人类文明史上占有重要地位的标志之一。
1. Compass
The invention of pass is the result of China ancient working people know to the object ism in the long-term practice.
1。指南针
指南针的发明是我国古代劳动人民长期实践中认识到物体的磁性的结果。
Because of productive labor, people have found the characteristic of the pointing to direction. Through experiment and research in many ways, invented pass at last.
由于生产劳动,人们已经发现了磁铁的指出方向的特点,。通过试验和在许多方面的研究,发明了指南针。
pass give play to important function in the navigation after introducing to Europe.
指南针在传入欧洲后,在导航上发挥了重要的作用
2. Gunpowder
The gunpowder is made of niter, sulfur and charcoal three kinds of materials mixing.
2。***
***是由硝石、硫和木炭三种原料混合制成的。
In the Tang Dynasty, the gunpowder begins to be applied to the military affairs.
People utilize the throwing stone machine, light the gunpowder bag and throw out, burn the enemy, this is the most primitive cannon.
唐朝,***开始应用到军事上。
人们利用抛射石头的抛石机,把***包点着以后,抛射出去,烧伤敌人,这是最原始的火炮。
In the Eastern Han Dynasty (. 105), the papermaking skill inventor Cai lun is on the basis of that forefathers weave silks experience, Have made into the vegetable fiber paper with bark, broken work, rag, etc. raw materials. From then on, paper e to the material that generally write.
东汉和帝元兴元年(公元105年),蔡伦在总结前人制造丝织晶的经验的基础上,发明了用树皮、破渔网、破布、麻头等作为原料,制造成了适合书写的植物纤维纸,才使纸成为人们普遍使用的书写材料。被称为“蔡侯纸”。