At the age of seven, I could ride a bike. Bicycle is the simplest and most popular means of transportation, and children, young people and the elderly can ride it. It is simple, but not simple. According to my riding experience, I have some questions to ask my father. I think the bicycle body embodies the scientific principle: its movement includes the rotation and translation that we learned in the third grade mathematics; The brake is a simple lever, which can brake the car with little force. Its wheels, with dozens of steel wires to tighten the shaft, are very light and strong, and can bear the weight dozens of times heavier than its own weight.

Bicycle is the most environmentally-friendly, safest and most convenient means of transportation. There is no need for gasoline, electricity, exhaust and parking, which does not take up space, and there are few safety accidents. You can sit in sunny, rainy, foggy and snowy days; Whether it is a high-grade highway, crowded streets, alleys, rugged mountain roads or manor ridges, you can drive. Bicycle is a means of transportation and fitness equipment, which can exercise, enhance physical fitness and adjust weight if you ride it frequently.

There are more and more motor vehicles, the climate is warming, and the vehicles that destroy the atmospheric environment are the culprit, and the bicycle tree is completely deserved as an environmental hero! In the Netherlands, one of the richest countries in Europe, more than three people use bicycles as a means of transportation to maintain the bicycle kingdom. For the sake of environmental protection, health and safety, let's go to the Netherlands to study and ride less bicycles and motor vehicles. Bicycles will not be out of date, long live bicycles!