In today's society, the means of transportation are very developed. Cars, ships, planes, trains and rockets are all modern means of transportation. How did these modern means of transportation come from? It developed from ancient times. In the past, people had to rely on their own feet, whether climbing mountains and wading or long-distance migration. If you encounter a fast-flowing river, people can only cross the river with buoyant wooden poles, so people invented rafts and boats. In order to make the boat faster and more convenient, paddles and sails were invented. The invention of the automobile is a great event in the history of civilization. You can have a car only with wheels. So, has anyone combined the wheel with the boat? Yes! Smart China people put wheels on the ship as early as the Tang Dynasty, which made the ship advance at a faster speed than by going up one flight of stairs. Sina, one of the four great inventions in ancient times, played a role when people sailed in the vast sea. Soon after the invention of the steam car, traffic reached a new climax. The history of cars running on the road is not long, but the development speed exceeds people's expectations. Now there are energy-saving cars and solar cars ... students, work hard for the convenience of scientific and technological development in the future!