中國(guó)四大發(fā)明英文介紹.ppt

1、The Four Great Inventions Of Ancient China,China Ancient Four Inventions,1.Papermaking skill（造紙術(shù)）,The Western Han has already had paper at the beginning of the 2nd century BC, Cailun just transformed the paper.,Paper-making Process,Historical Significance of Papermaking,The papermaking invention pro

2、vides mankind with an economic and convenience writing material, setting off a human text revolution.,2.Printing（印刷術(shù)）,In Sui Dynasty, people first invented woodblock printing.,In Song Dynasty, Bi Sheng invented typography and improved woodblock printing these disadvantages .,3.Gunpowder（火藥）,Gunpowde

3、r was invented in the Sui and Tang Dynasties, dating back more than a thousand years.,The invention of gunpowder is come from the system Dan making process.,Later, gunpowder was applied to the military.,4.Compass（指南針 ）,In the past , Humans determined the direction mainly by the sun or the moon.,The

4、invention of the compass is the result of people in the practice of long-term understanding of objects magnetic. It was originally known as Sinan.,Later, people have created suitable for sailing compass.,No matter wherever you are ,you can hold a compass in you hand and it will point toward the South pole.,The Summary（總結(jié)）,In a word,these great inventions once influenced and benefited the w