Some articles hold the opinions that the greatest invention in the world is electricity,while the others believe computers are unreplaced in modern read and read,suddenly an idea struke me:The greates
正文：There are four world famous inventions in China, one is gunpowder, the other is compass, the third is printing and the fourth is papermaking.我国有世界著名的四大发明，一是火药，二是指南针，
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