英语翻译There have been mang great inventions,the things have ch
英语翻译 There have been mang great inventions,the things have changed our lives.The first great invention was still very important today-the wheel.This made it easier to carry heary things ang to travel long distances. In the early 1800's the world started to change.There was little unknow land left in the world.People didn't have to explore much ang more.They began to work instead to make life better.