以下是关于自行车用英语的介绍： **Bicycle** A bicycle, often simply called a bike, is a human-powered vehicle with two wheels.

It is one of the most common and convenient forms of transportation.

The basic components of a bicycle include the frame, wheels, handlebars, pedals, and a seat. The frame holds everything together and provides the structure. The wheels allow the bike to move smoothly on the ground. The handlebars help control the direction, and the pedals are where you apply force to make the bike move. Bicycles come in various types and styles. There are road bikes designed for speed and long-distance rides on smooth roads, mountain bikes for off-road adventures with better shock absorption and traction, and city bikes for commuting and short trips in urban areas. Riding a bicycle has many benefits.

It is an environmentally friendly mode of transportation that doesn't produce pollution.

It also helps to keep you fit and active as it requires physical effort. Moreover, it can be a fun and enjoyable activity, whether you're cycling alone or with friends. In many countries, bicycles are widely used for both practical purposes like going to work or school, and for recreational activities such as cycling tours and races.