Unicycle, one of the special bicycles. It consists of a wheel, a saddle and a set of pedal transmission devices (axle, crank and pedal), and the riding direction is only controlled by human balance. Limited to acrobatic performances.
Bicycles, also known as bicycles or bicycles, are usually small land vehicles with two wheels. After people get on the bus, they are green and environmentally friendly vehicles powered by pedaling. British bicycles. Where bi stands for two, and cycle stands for wheels, that is, a two-wheeled vehicle.
In China, Taiwan Province Province and Singapore, it is usually called "bicycle" or "bicycle"; In Hong Kong and Macao, it is usually called "bicycle" (in fact, it is generally called in Cantonese); In Japan, it is called "self-transfer". There are many kinds of bicycles, including single bicycle, double bicycle and multiplayer bicycle.
It can be used as an environmentally friendly means of transportation and tourism; More and more people use bicycles as fitness equipment for riding and cycling. Cycling itself is also a competitive sport, including road cycling, mountain cycling, track cycling and acrobatic cycling.
By the end of 20 19, the number of bicycles and electric bicycles in China has reached nearly 400 million, ranking first in the world.